diff --git a/src/services/services.ts b/src/services/services.ts
index 44c587974df..4a6848ef3b0 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -3807,6 +3807,10 @@ module ts {
                         return undefined;
                     }
                 }
+                else { 
+                    // unsupported modifier
+                    return undefined;
+                }
 
                 var keywords: Node[] = [];
                 var modifierFlag: NodeFlags = getFlagFromModifier(modifier);
diff --git a/tests/cases/fourslash/getOccurrencesConst.ts b/tests/cases/fourslash/getOccurrencesConst.ts
new file mode 100644
index 00000000000..107ad4a5c24
--- /dev/null
+++ b/tests/cases/fourslash/getOccurrencesConst.ts
@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+/////*1*/const enum E1 {
+////    v1,
+////    v2
+////}
+////
+/////*2*/const c = 0;
+
+goTo.marker("1");
+verify.occurrencesAtPositionCount(0);
+
+goTo.marker("2");
+verify.occurrencesAtPositionCount(0);