diff --git a/src/libs/cplusplus/pp-engine.cpp b/src/libs/cplusplus/pp-engine.cpp
index 6a414d8b0fd12d7ac39772cf1475a2ba290d0f75..13913745d9c5b440f524a9a67cefa575db8929bc 100644
--- a/src/libs/cplusplus/pp-engine.cpp
+++ b/src/libs/cplusplus/pp-engine.cpp
@@ -89,7 +89,7 @@ static bool same(const char *a, const char *b, int size)
 
 static bool isQtReservedWord(const char *name, int size)
 {
-    if (size < 4)
+    if (size < 3)
         return false;
 
     const char c = name[0];