diff --git a/src/GvimExt/Makefile b/src/GvimExt/Makefile
index b451981..a57840f 100644
--- a/src/GvimExt/Makefile
+++ b/src/GvimExt/Makefile
@@ -16,6 +16,9 @@
 # On Windows NT
 ! ifndef CPU
 CPU = i386
+!  if !defined(PLATFORM) && defined(TARGET_CPU)
+PLATFORM = $(TARGET_CPU)
+!  endif
 !  ifdef PLATFORM
 !   if ("$(PLATFORM)" == "x64") || ("$(PLATFORM)" == "X64")
 CPU = AMD64