diff --git a/config.mk b/config.mk
index 9bd834a..9aec006 100644
--- a/config.mk
+++ b/config.mk
@@ -8,6 +8,6 @@ CHIPDB_SUBDIR ?= icebox
 ifeq ($(MXE),1)
 EXE = .exe
 CXX = /usr/local/src/mxe/usr/bin/i686-w64-mingw32.static-gcc
-CC ?= $(CXX)
+CC = $(CXX)
 PKG_CONFIG = /usr/local/src/mxe/usr/bin/i686-w64-mingw32.static-pkg-config
 endif