diff --git a/Makefile b/Makefile
index f2427e89..c37ae06d 100644
--- a/Makefile
+++ b/Makefile
@@ -164,21 +164,21 @@ src/asm/parser.c: src/asm/parser.y
 
 # Only RGBGFX uses libpng (POSIX make doesn't support pattern rules to cover all these)
 src/gfx/main.o: src/gfx/main.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 src/gfx/pal_packing.o: src/gfx/pal_packing.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 src/gfx/pal_sorting.o: src/gfx/pal_sorting.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 src/gfx/pal_spec.o: src/gfx/pal_spec.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 src/gfx/process.o: src/gfx/process.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 src/gfx/proto_palette.o: src/gfx/proto_palette.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 src/gfx/reverse.o: src/gfx/reverse.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 src/gfx/rgba.o: src/gfx/rgba.cpp
-	$Q${CXX} ${REALCXXFLAGS} -c -o $@ $<
+	$Q${CXX} ${REALCXXFLAGS} ${PNGCFLAGS} -c -o $@ $<
 
 .c.o:
 	$Q${CC} ${REALCFLAGS} -c -o $@ $<