diff --git a/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/MutationSignature.java b/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/MutationSignature.java
index dc88839b7d03..dfdd92d2547c 100644
--- a/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/MutationSignature.java
+++ b/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/MutationSignature.java
@@ -138,7 +138,11 @@ public final class MutationSignature {
 
   @Override
   public int hashCode() {
-    return (myThis ? 4247 : 22661) + (myIo ? 137 : 731) + Arrays.hashCode(myParameters);
+    int result = myKind.hashCode();
+    result = 31 * result + Boolean.hashCode(myThis);
+    result = 31 * result + Boolean.hashCode(myIo);
+    result = 31 * result + Arrays.hashCode(myParameters);
+    return result;
   }
 
   @Override