diff --git a/javascript/extractor/src/com/semmle/js/extractor/ASTExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/ASTExtractor.java
index 719d4881dca..ba6ef39efd2 100644
--- a/javascript/extractor/src/com/semmle/js/extractor/ASTExtractor.java
+++ b/javascript/extractor/src/com/semmle/js/extractor/ASTExtractor.java
@@ -891,7 +891,7 @@ public class ASTExtractor {
     private void extractFunctionAttributes(IFunction nd, Label key) {
       if (nd.isGenerator()) trapwriter.addTuple("is_generator", key);
       if (nd.hasRest()) trapwriter.addTuple("has_rest_parameter", key);
-      if (nd.isAsync()) trapwriter.addTuple("isAsync", key);
+      if (nd.isAsync()) trapwriter.addTuple("is_async", key);
     }
 
     @Override
diff --git a/javascript/extractor/tests/es2017/output/trap/async-await.js.trap b/javascript/extractor/tests/es2017/output/trap/async-await.js.trap
index bc3f77e86cd..cd79c3985ef 100644
--- a/javascript/extractor/tests/es2017/output/trap/async-await.js.trap
+++ b/javascript/extractor/tests/es2017/output/trap/async-await.js.trap
@@ -232,7 +232,7 @@ decl(#20078,#20077)
 #20079=@"var;{arguments};{#20076}"
 variables(#20079,"arguments",#20076)
 is_arguments_object(#20079)
-isAsync(#20073)
+is_async(#20073)
 #20080=*
 stmts(#20080,1,#20073,-2,"{\n  try ... ;\n  }\n}")
 #20081=@"loc,{#10000},1,30,7,1"
diff --git a/javascript/extractor/tests/es2017/output/trap/export-async-1.js.trap b/javascript/extractor/tests/es2017/output/trap/export-async-1.js.trap
index f9739c67bb4..86da62095d0 100644
--- a/javascript/extractor/tests/es2017/output/trap/export-async-1.js.trap
+++ b/javascript/extractor/tests/es2017/output/trap/export-async-1.js.trap
@@ -108,7 +108,7 @@ scopenesting(#20034,#20027)
 #20035=@"var;{arguments};{#20034}"
 variables(#20035,"arguments",#20034)
 is_arguments_object(#20035)
-isAsync(#20031)
+is_async(#20031)
 #20036=*
 stmts(#20036,1,#20031,-2,"{}")
 #20037=@"loc,{#10000},1,35,1,36"
diff --git a/javascript/extractor/tests/es2017/output/trap/export-async-2.js.trap b/javascript/extractor/tests/es2017/output/trap/export-async-2.js.trap
index 004c49b7c2e..d13cc444d29 100644
--- a/javascript/extractor/tests/es2017/output/trap/export-async-2.js.trap
+++ b/javascript/extractor/tests/es2017/output/trap/export-async-2.js.trap
@@ -96,7 +96,7 @@ scopenesting(#20030,#20025)
 #20031=@"var;{arguments};{#20030}"
 variables(#20031,"arguments",#20030)
 is_arguments_object(#20031)
-isAsync(#20028)
+is_async(#20028)
 #20032=*
 stmts(#20032,1,#20028,-2,"{}")
 #20033=@"loc,{#10000},1,34,1,35"
diff --git a/javascript/extractor/tests/es2017/output/trap/invalid-async-fn.js.trap b/javascript/extractor/tests/es2017/output/trap/invalid-async-fn.js.trap
index 8215bd97037..03b1c5fb16c 100644
--- a/javascript/extractor/tests/es2017/output/trap/invalid-async-fn.js.trap
+++ b/javascript/extractor/tests/es2017/output/trap/invalid-async-fn.js.trap
@@ -109,7 +109,7 @@ hasLocation(#20034,#20015)
 expr_containers(#20034,#20030)
 literals("x","x",#20034)
 decl(#20034,#20033)
-isAsync(#20030)
+is_async(#20030)
 #20035=*
 exprs(#20035,79,#20030,-2,"x")
 hasLocation(#20035,#20023)
diff --git a/javascript/extractor/tests/es2018/output/trap/asyncIter.js.trap b/javascript/extractor/tests/es2018/output/trap/asyncIter.js.trap
index 66d4f544f7a..cd9b4fbd27e 100644
--- a/javascript/extractor/tests/es2018/output/trap/asyncIter.js.trap
+++ b/javascript/extractor/tests/es2018/output/trap/asyncIter.js.trap
@@ -381,7 +381,7 @@ scopenesting(#20139,#20000)
 variables(#20140,"arguments",#20139)
 is_arguments_object(#20140)
 is_generator(#20137)
-isAsync(#20137)
+is_async(#20137)
 #20141=*
 stmts(#20141,1,#20137,-2,"{}")
 #20142=@"loc,{#10000},1,27,1,28"
@@ -432,7 +432,7 @@ scopenesting(#20152,#20146)
 variables(#20153,"arguments",#20152)
 is_arguments_object(#20153)
 is_generator(#20150)
-isAsync(#20150)
+is_async(#20150)
 #20154=*
 stmts(#20154,1,#20150,-2,"{}")
 #20155=@"loc,{#10000},4,22,4,23"
@@ -482,7 +482,7 @@ scopenesting(#20165,#20146)
 variables(#20166,"arguments",#20165)
 is_arguments_object(#20166)
 is_generator(#20163)
-isAsync(#20163)
+is_async(#20163)
 #20167=*
 stmts(#20167,1,#20163,-2,"{}")
 #20168=@"loc,{#10000},5,35,5,36"
@@ -572,7 +572,7 @@ scopenesting(#20188,#20000)
 variables(#20189,"arguments",#20188)
 is_arguments_object(#20189)
 is_generator(#20186)
-isAsync(#20186)
+is_async(#20186)
 #20190=*
 stmts(#20190,1,#20186,-2,"{}")
 #20191=@"loc,{#10000},9,22,9,23"
@@ -620,7 +620,7 @@ scopenesting(#20200,#20000)
 variables(#20201,"arguments",#20200)
 is_arguments_object(#20201)
 is_generator(#20198)
-isAsync(#20198)
+is_async(#20198)
 #20202=*
 stmts(#20202,1,#20198,-2,"{}")
 #20203=@"loc,{#10000},10,35,10,36"
diff --git a/javascript/extractor/tests/esnext/output/trap/async-generators.js.trap b/javascript/extractor/tests/esnext/output/trap/async-generators.js.trap
index 0fc53eab7c8..67f29efe9f8 100644
--- a/javascript/extractor/tests/esnext/output/trap/async-generators.js.trap
+++ b/javascript/extractor/tests/esnext/output/trap/async-generators.js.trap
@@ -206,7 +206,7 @@ scopenesting(#20072,#20000)
 variables(#20073,"arguments",#20072)
 is_arguments_object(#20073)
 is_generator(#20069)
-isAsync(#20069)
+is_async(#20069)
 #20074=*
 stmts(#20074,1,#20069,-2,"{\n}")
 #20075=@"loc,{#10000},1,23,2,1"
@@ -234,7 +234,7 @@ variables(#20080,"x",#20079)
 #20081=@"var;{arguments};{#20079}"
 variables(#20081,"arguments",#20079)
 is_arguments_object(#20081)
-isAsync(#20076)
+is_async(#20076)
 #20082=*
 stmts(#20082,1,#20076,-2,"{\n  for ... o());\n}")
 #20083=@"loc,{#10000},4,22,6,1"
diff --git a/javascript/extractor/tests/flow/output/trap/async.js.trap b/javascript/extractor/tests/flow/output/trap/async.js.trap
index bdee37ef303..b53ba8247ff 100644
--- a/javascript/extractor/tests/flow/output/trap/async.js.trap
+++ b/javascript/extractor/tests/flow/output/trap/async.js.trap
@@ -141,7 +141,7 @@ expr_containers(#20046,#20001)
 scopes(#20048,1)
 scopenodes(#20046,#20048)
 scopenesting(#20048,#20000)
-isAsync(#20046)
+is_async(#20046)
 #20049=*
 exprs(#20049,92,#20046,-2,"await foo()")
 #20050=@"loc,{#10000},1,38,1,48"
diff --git a/javascript/ql/src/semmle/javascript/Aliases.qll b/javascript/ql/src/semmle/javascript/Aliases.qll
index d9ec2b0077d..b97e5911e45 100644
--- a/javascript/ql/src/semmle/javascript/Aliases.qll
+++ b/javascript/ql/src/semmle/javascript/Aliases.qll
@@ -290,3 +290,8 @@ deprecated predicate isGenerator(Function fun) { is_generator(fun) }
  * Use `Function#hasRestParameter()` instead.
  */ 
 deprecated predicate hasRestParameter(Function fun) { has_rest_parameter(fun) }
+/**
+ * Alias for the predicate `is_async` defined in the .dbscheme.
+ * Use `Function#isAsync()` instead.
+ */ 
+deprecated predicate isAsync(Function fun) { is_async(fun) }
diff --git a/javascript/ql/src/semmle/javascript/Functions.qll b/javascript/ql/src/semmle/javascript/Functions.qll
index 68f336074bc..43c293417c2 100644
--- a/javascript/ql/src/semmle/javascript/Functions.qll
+++ b/javascript/ql/src/semmle/javascript/Functions.qll
@@ -202,7 +202,7 @@ class Function extends @function, Parameterized, TypeParameterized, StmtContaine
   predicate hasTrailingComma() { lastTokenOfParameterList().getNextToken().getValue() = "," }
 
   /** Holds if this function is an asynchronous function. */
-  predicate isAsync() { isAsync(this) }
+  predicate isAsync() { is_async(this) }
 
   /** Holds if this function is asynchronous or a generator. */
   predicate isAsyncOrGenerator() { isAsync() or isGenerator() }
diff --git a/javascript/ql/src/semmlecode.javascript.dbscheme b/javascript/ql/src/semmlecode.javascript.dbscheme
index 76c1efe798f..89a04b25086 100644
--- a/javascript/ql/src/semmlecode.javascript.dbscheme
+++ b/javascript/ql/src/semmlecode.javascript.dbscheme
@@ -441,7 +441,7 @@ scopenesting (unique int inner: @scope ref,
 
 is_generator (int fun: @function ref);
 has_rest_parameter (int fun: @function ref);
-isAsync (int fun: @function ref);
+is_async (int fun: @function ref);
 
 // variables and lexically scoped type names
 #keyset[scope, name]
diff --git a/javascript/ql/src/semmlecode.javascript.dbscheme.stats b/javascript/ql/src/semmlecode.javascript.dbscheme.stats
index b231d1c1e74..7b0782d0265 100644
--- a/javascript/ql/src/semmlecode.javascript.dbscheme.stats
+++ b/javascript/ql/src/semmlecode.javascript.dbscheme.stats
@@ -11709,7 +11709,7 @@
 <dependencies/>
 </relation>
 <relation>
-<name>isAsync</name>
+<name>is_async</name>
 <cardinality>50</cardinality>
 <columnsizes>
 <e>
diff --git a/javascript/upgrades/c73fbfca57f3d593b9ff50c6aa3a886d6888efec/upgrade.properties b/javascript/upgrades/c73fbfca57f3d593b9ff50c6aa3a886d6888efec/upgrade.properties
index b3ead7f8d42..3b782318fcb 100644
--- a/javascript/upgrades/c73fbfca57f3d593b9ff50c6aa3a886d6888efec/upgrade.properties
+++ b/javascript/upgrades/c73fbfca57f3d593b9ff50c6aa3a886d6888efec/upgrade.properties
@@ -90,3 +90,5 @@ is_generator.rel: reorder isGenerator.rel(int fun) fun
 isGenerator.rel: delete
 has_rest_parameter.rel: reorder hasRestParameter.rel(int fun) fun
 hasRestParameter.rel: delete
+is_async.rel: reorder isAsync.rel(int fun) fun
+isAsync.rel: delete