diff --git a/csharp/ql/src/semmle/code/csharp/dataflow/DefUse.qll b/csharp/ql/src/semmle/code/csharp/dataflow/DefUse.qll
deleted file mode 100644
index ce70614d6ad..00000000000
--- a/csharp/ql/src/semmle/code/csharp/dataflow/DefUse.qll
+++ /dev/null
@@ -1,8 +0,0 @@
-/**
- * Provides classes and predicates for working with variable definitions and uses.
- */
-
-// This file is kept for backwards compatibility
-
-import csharp
-import SSA
diff --git a/csharp/ql/test/library-tests/dataflow/callablereturnsarg/Common.qll b/csharp/ql/test/library-tests/dataflow/callablereturnsarg/Common.qll
index 1272dfb22f1..92d128462dc 100644
--- a/csharp/ql/test/library-tests/dataflow/callablereturnsarg/Common.qll
+++ b/csharp/ql/test/library-tests/dataflow/callablereturnsarg/Common.qll
@@ -1,5 +1,4 @@
 import csharp
-import semmle.code.csharp.dataflow.DefUse
 import semmle.code.csharp.controlflow.Guards
 
 class Configuration extends DataFlow::Configuration {