diff --git a/Makefile b/Makefile
index bcb90f6..cc9b48b 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ create-builddir:
 
 fetch-sources: create-builddir
 	curl -o $(BUILDDIR)/data/$(SOURCE_FILENAME) $(SOURCE)
-	md5sum -c <<< "$(CHECKSUM) $(BUILDDIR)/data/$(SOURCE_FILENAME)"
+	echo "$(CHECKSUM) $(BUILDDIR)/data/$(SOURCE_FILENAME)" | md5sum -c
 
 patch-version: create-builddir
 	sed -e "s|@PKG_VERSION@|$(PKG_VERSION)|" \