diff --git a/win32/GNUmakefile b/win32/GNUmakefile
index bda1dfd..1d44da9 100644
--- a/win32/GNUmakefile
+++ b/win32/GNUmakefile
@@ -88,7 +88,7 @@ else
 endif
 
 # Global flags for all compilers
-CFLAGS	= $(OPT) -D$(DB) -DWIN32 -DLIBSSH2_WIN32 # -DHAVE_CONFIG_H
+CFLAGS	= $(OPT) -D$(DB) -DLIBSSH2_WIN32 # -DHAVE_CONFIG_H
 ifeq ($(ARCH),w64)
 CFLAGS	+= -D_AMD64_
 endif
diff --git a/win32/test/GNUmakefile b/win32/test/GNUmakefile
index 09e19d7..70548b1 100644
--- a/win32/test/GNUmakefile
+++ b/win32/test/GNUmakefile
@@ -79,7 +79,7 @@ else
 endif
 
 # Global flags for all compilers
-CFLAGS	= $(OPT) -D$(DB) -DWIN32 -DLIBSSH2_WIN32 # -DHAVE_CONFIG_H
+CFLAGS	= $(OPT) -D$(DB) -DLIBSSH2_WIN32 # -DHAVE_CONFIG_H
 ifeq ($(ARCH),w64)
 CFLAGS  += -D_AMD64_
 endif