diff --git a/win32/GNUmakefile b/win32/GNUmakefile
index 0d95d81..da56ffa 100644
--- a/win32/GNUmakefile
+++ b/win32/GNUmakefile
@@ -110,7 +110,7 @@ endif
 -include $(OBJDIR)/version.inc
 
 # Global flags for all compilers
-CFLAGS	= $(OPT) -D$(DB) -DLIBSSH2_WIN32 # -DHAVE_CONFIG_H
+CFLAGS	= $(LIBSSH2_CFLAG_EXTRAS) $(OPT) -D$(DB) -DLIBSSH2_WIN32 # -DHAVE_CONFIG_H
 
 ifeq ($(CC),mwcc)
 LD	= mwld