diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiFactory.java b/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiFactory.java
index 126a7cc9126..9065298f9b9 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiFactory.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiFactory.java
@@ -122,7 +122,7 @@ public class JetPsiFactory {
     private static <T> T createDeclaration(Project project, String text, Class<T> clazz) {
         JetFile file = createFile(project, text);
         List<JetDeclaration> dcls = file.getDeclarations();
-        assert dcls.size() == 1 : dcls.size();
+        assert dcls.size() == 1 : dcls.size() + " declarations in " + text;
         @SuppressWarnings("unchecked")
         T result = (T) dcls.get(0);
         return result;