diff --git a/sgdk/Makefile b/sgdk/Makefile
index eabe7aa..e3ea221 100644
--- a/sgdk/Makefile
+++ b/sgdk/Makefile
@@ -17,9 +17,15 @@ all: SGDK tools $(LIBMD)
 
 tools: $(BINTOS) $(RESCOMP) $(XGMTOOL) $(WAVTORAW) $(PCMTORAW) $(SIZEBND) $(LZ4W)
 
+# OSX sed fails without the '', and GNU fails with, cool beans
+SED_FIX=
+ifeq ($(shell uname -s),Darwin)
+	SED_FIX=''
+endif
+
 $(LIBMD):
 	# Compress resources with lz4w instead of aplib
-	sed -i  '' 's/-1/2/g' SGDK/res/libres.res
+	sed -i  $(SED_FIX) 's/-1/2/g' SGDK/res/libres.res
 	cp -f Makefile.libmd SGDK/Makefile
 	make -C SGDK
 	cp -f SGDK/libmd.a $@