diff --git src/drivers/Qt/HexEditor.cpp src/drivers/Qt/HexEditor.cpp
index 8f078ac..010b2cf 100644
--- a/src/drivers/Qt/HexEditor.cpp
+++ b/src/drivers/Qt/HexEditor.cpp
@@ -43,6 +43,8 @@
 #include "Qt/ConsoleUtilities.h"
 #include "Qt/ConsoleWindow.h"
 
+#undef isascii
+
 static bool memNeedsCheck = false;
 static HexBookMarkManager_t hbm;
 static std::list <HexEditorDialog_t*> winList;
