diff --git a/Makefile b/Makefile
index 8a9ed62..1c6b3e0 100644
--- a/Makefile
+++ b/Makefile
@@ -54,8 +54,8 @@ get-sources: $(SRC_FILE)
 
 $(SRC_FILE):
 	@echo -n "Downloading $(URL)... "
-	@wget -q $(URL)
-	@wget -q $(URL_SIGN)
+	@wget -q -N $(URL)
+	@wget -q -N $(URL_SIGN)
 	@echo "OK."
 
 import-keys: