diff --git a/Externals/wxWidgets3/src/common/glcmn.cpp b/Externals/wxWidgets3/src/common/glcmn.cpp
index 09d9dd6582..c8276bc384 100644
--- a/Externals/wxWidgets3/src/common/glcmn.cpp
+++ b/Externals/wxWidgets3/src/common/glcmn.cpp
@@ -16,6 +16,7 @@
 // ----------------------------------------------------------------------------
 
 // for compilers that support precompilation, includes "wx.h".
+#define GL_GLEXT_PROTOTYPES
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__