diff --git a/src/services/services.ts b/src/services/services.ts
index bc745598b8f..0ee0c4f75c3 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -614,7 +614,7 @@ module ts {
                     }
 
                     if (paramHelpStringMargin === undefined) {
-                        paramHelpStringMargin = sourceFile.getOneBasedLineAndCharacterOfPosition(firstLineParamHelpStringPos).character - 1;
+                        paramHelpStringMargin = sourceFile.getZeroBasedLineAndCharacterOfPosition(firstLineParamHelpStringPos).character;
                     }
 
                     // Now consume white spaces max