diff --git a/java/openapi/src/com/intellij/psi/util/MethodSignatureUtil.java b/java/openapi/src/com/intellij/psi/util/MethodSignatureUtil.java
index 5d8f08c851a6..fd16f48cd51c 100644
--- a/java/openapi/src/com/intellij/psi/util/MethodSignatureUtil.java
+++ b/java/openapi/src/com/intellij/psi/util/MethodSignatureUtil.java
@@ -320,7 +320,7 @@ public class MethodSignatureUtil {
   public static boolean isSubsignature(MethodSignature superSignature, MethodSignature subSignature) {
     if (subSignature == superSignature) return true;
     if (!areSignaturesEqualLightweight(superSignature, subSignature)) return false;
-    PsiSubstitutor unifyingSubstitutor = getSuperMethodSignatureSubstitutor(superSignature, subSignature);
+    PsiSubstitutor unifyingSubstitutor = getSuperMethodSignatureSubstitutor(subSignature, superSignature);
     if (checkSignaturesEqualInner(superSignature, subSignature, unifyingSubstitutor)) return true;
 
     if (subSignature.getTypeParameters().length > 0) return false;