diff --git a/python/src/com/jetbrains/python/PyCustomType.java b/python/src/com/jetbrains/python/PyCustomType.java
index bb1190539251..d01170f9d40f 100644
--- a/python/src/com/jetbrains/python/PyCustomType.java
+++ b/python/src/com/jetbrains/python/PyCustomType.java
@@ -112,7 +112,7 @@ public class PyCustomType implements PyClassLikeType {
 
     // Delegate calls to classes, we mimic but filter if filter is set.
     for (final PyClassLikeType typeToMimic : myTypesToMimic) {
-      final List<? extends RatedResolveResult> results = typeToMimic.resolveMember(name, location, direction, resolveContext, inherited);
+      final List<? extends RatedResolveResult> results = typeToMimic.toInstance().resolveMember(name, location, direction, resolveContext, inherited);
       if (results != null) {
         globalResult.addAll(Collections2.filter(results, new ResolveFilter()));
       }