diff --git a/src/libs/cplusplus/pp-engine.cpp b/src/libs/cplusplus/pp-engine.cpp
index de18711233b..d8221b151f6 100644
--- a/src/libs/cplusplus/pp-engine.cpp
+++ b/src/libs/cplusplus/pp-engine.cpp
@@ -203,7 +203,7 @@ struct Value
     inline bool is_zero () const
     { return l == 0; }
 
-    template<typename T> static bool cmpImpl(T v1, T v2)
+    template<typename T> static int cmpImpl(T v1, T v2)
     {
         if (v1 < v2)
             return -1;