diff --git a/vcl/win/source/gdi/MAKEFILE.MK b/vcl/win/source/gdi/MAKEFILE.MK
index d50abc1b5aa3..a6d84d41f3ea 100644
--- a/vcl/win/source/gdi/MAKEFILE.MK
+++ b/vcl/win/source/gdi/MAKEFILE.MK
@@ -44,7 +44,6 @@ TARGET=salgdi
 
 # --- #105371#
 .IF "$(COM)"=="GCC"
-CDEFS += -UWINVER -DWINVER=0x0400
 .ELSE
 CFLAGS += -DWINVER=0x0400
 .ENDIF
diff --git a/vcl/win/source/window/MAKEFILE.MK b/vcl/win/source/window/MAKEFILE.MK
index 9a65a5000ccf..17e73db1e75e 100644
--- a/vcl/win/source/window/MAKEFILE.MK
+++ b/vcl/win/source/window/MAKEFILE.MK
@@ -43,7 +43,7 @@ ENABLE_EXCEPTIONS=TRUE
 
 # --- #105371#
 .IF "$(COM)"=="GCC"
-CDEFS += -UWINVER -DWINVER=0x0400 -D_WIN32_WINNT=0x0501
+CFLAGS += -D_WIN32_WINNT=0x0501
 .ELSE
 CFLAGS += -DWINVER=0x0400 -D_WIN32_WINNT=0x0501