diff --git a/platform/indexing-impl/src/com/intellij/psi/impl/search/LowLevelSearchUtil.java b/platform/indexing-impl/src/com/intellij/psi/impl/search/LowLevelSearchUtil.java
index 6f5f5f403b97..9d7b11813ffe 100644
--- a/platform/indexing-impl/src/com/intellij/psi/impl/search/LowLevelSearchUtil.java
+++ b/platform/indexing-impl/src/com/intellij/psi/impl/search/LowLevelSearchUtil.java
@@ -79,7 +79,7 @@ public class LowLevelSearchUtil {
                                            @NotNull ProgressIndicator progress,
                                            TreeElement lastElement) {
     if (scope instanceof PsiCompiledElement) {
-      throw new IllegalArgumentException("Scope is compiled, can't scan: "+scope);
+      throw new IllegalArgumentException("Scope is compiled, can't scan: "+scope+"; containingFile: "+scope.getContainingFile());
     }
     final int scopeStartOffset = scope.getTextRange().getStartOffset();
     final int patternLength = searcher.getPatternLength();