diff --git a/compiler/frontend/src/org/jetbrains/kotlin/util/slicedMap/SlicedMapImpl.java b/compiler/frontend/src/org/jetbrains/kotlin/util/slicedMap/SlicedMapImpl.java
index cd68fa34f60..5c0cdf24253 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/util/slicedMap/SlicedMapImpl.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/util/slicedMap/SlicedMapImpl.java
@@ -78,6 +78,7 @@ public class SlicedMapImpl implements MutableSlicedMap {
     @Override
     public void clear() {
         map.clear();
+        collectiveSliceKeys = null;
     }
 
     @Override