diff --git a/dom/bindings/parser/WebIDL.py b/dom/bindings/parser/WebIDL.py
index 13f9fd70bfc5..d38e46688e21 100644
--- a/dom/bindings/parser/WebIDL.py
+++ b/dom/bindings/parser/WebIDL.py
@@ -3162,7 +3162,7 @@ class IDLBuiltinType(IDLType):
         self._clamped = None
         self._rangeEnforced = None
         self._withTreatNullAs = None
-        if self.isNumeric():
+        if self.isInteger():
             if clamp:
                 self.clamp = True
                 self.name = "Clamped" + self.name
@@ -3172,7 +3172,7 @@ class IDLBuiltinType(IDLType):
                 self.name = "RangeEnforced" + self.name
                 self._extendedAttrDict["EnforceRange"] = True
         elif clamp or enforceRange:
-            raise WebIDLError("Non-numeric types cannot be [Clamp] or [EnforceRange]", attrLocation)
+            raise WebIDLError("Non-integer types cannot be [Clamp] or [EnforceRange]", attrLocation)
         if self.isDOMString():
             if treatNullAsEmpty:
                 self.treatNullAsEmpty = True
diff --git a/dom/bindings/parser/tests/test_attributes_on_types.py b/dom/bindings/parser/tests/test_attributes_on_types.py
index 43daca3c453c..b1175c57ad80 100644
--- a/dom/bindings/parser/tests/test_attributes_on_types.py
+++ b/dom/bindings/parser/tests/test_attributes_on_types.py
@@ -167,30 +167,32 @@ def WebIDLTest(parser, harness):
 
     harness.ok(threw, "Should not allow mixing [Clamp] and [EnforceRange] via typedefs")
 
-    parser = parser.reset()
-    threw = False
-    try:
-        parser.parse("""
-            typedef [Clamp] DOMString Foo;
-        """)
-        parser.finish()
-    except:
-        threw = True
+    TYPES = ["DOMString", "unrestricted float", "float", "unrestricted double", "double"]
 
-    harness.ok(threw, "Should not allow [Clamp] on DOMString")
+    for type in TYPES:
+        parser = parser.reset()
+        threw = False
+        try:
+            parser.parse("""
+                typedef [Clamp] %s Foo;
+            """ % type)
+            parser.finish()
+        except:
+            threw = True
 
+        harness.ok(threw, "Should not allow [Clamp] on %s" % type)
 
-    parser = parser.reset()
-    threw = False
-    try:
-        parser.parse("""
-            typedef [EnforceRange] DOMString Foo;
-        """)
-        parser.finish()
-    except:
-        threw = True
+        parser = parser.reset()
+        threw = False
+        try:
+            parser.parse("""
+                typedef [EnforceRange] %s Foo;
+            """ % type)
+            parser.finish()
+        except:
+            threw = True
 
-    harness.ok(threw, "Should not allow [EnforceRange] on DOMString")
+        harness.ok(threw, "Should not allow [EnforceRange] on %s" % type)
 
 
     parser = parser.reset()