diff --git a/src/services/services.ts b/src/services/services.ts
index 4a92ec1985f..7fec4c26b00 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -4802,7 +4802,7 @@ module ts {
 
                         var start = signatureInfoString.length;
                         signatureInfoString += displayPartsToString(parameter.displayParts);
-                        var end = signatureInfoString.length - 1;
+                        var end = signatureInfoString.length;
 
                         // add the parameter to the list
                         parameters.push({