diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index 55d2447dd2d..2e14b40d05a 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -832,7 +832,7 @@ namespace ts {
                 if (verboseDebugInfo) {
                     verboseDebugString = "\r\nVerbose Debug Information: " + verboseDebugInfo();
                 }
-
+                debugger;
                 throw new Error("Debug Failure. False expression: " + (message || "") + verboseDebugString);
             }
         }
@@ -851,4 +851,4 @@ namespace ts {
         }
         return copiedList;
     }
-}
\ No newline at end of file
+}