diff --git a/java/ql/src/Likely Bugs/Comparison/MissingInstanceofInEquals.ql b/java/ql/src/Likely Bugs/Comparison/MissingInstanceofInEquals.ql
index 1f05298878a6..1c7bb13c0654 100644
--- a/java/ql/src/Likely Bugs/Comparison/MissingInstanceofInEquals.ql	
+++ b/java/ql/src/Likely Bugs/Comparison/MissingInstanceofInEquals.ql	
@@ -64,6 +64,7 @@ class UnimplementedEquals extends EqualsMethod {
 
 from EqualsMethod m
 where
+  m.getFile().isJavaSourceFile() and
   exists(m.getBody()) and
   exists(Parameter p | p = m.getAParameter() |
     // The parameter has no type test
diff --git a/java/ql/test/kotlin/query-tests/MissingInstanceofInEquals/Test.kt b/java/ql/test/kotlin/query-tests/MissingInstanceofInEquals/Test.kt
index 6eef90c517c5..d5d230bffefe 100644
--- a/java/ql/test/kotlin/query-tests/MissingInstanceofInEquals/Test.kt
+++ b/java/ql/test/kotlin/query-tests/MissingInstanceofInEquals/Test.kt
@@ -17,3 +17,9 @@ data class G(val x: Int) {
         return other != null && other.javaClass == this.javaClass
     }
 }
+
+data class H(val x: Int) {
+    override fun equals(other: Any?): Boolean {
+        return other != null
+    }
+}