diff --git a/src/gui/FWWindow.cpp b/src/gui/FWWindow.cpp
index 0079c0c77..3307c5411 100644
--- a/src/gui/FWWindow.cpp
+++ b/src/gui/FWWindow.cpp
@@ -165,7 +165,7 @@
 #include <qtoolbutton.h>
 
 
-extern void regCheck();
+extern bool regCheck();
 
 using namespace libfwbuilder;
 using namespace std;