diff --git a/Makefile b/Makefile
index 3c24816..e2c203a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 include config.mk
 
-SRC += abduco.c
+SRC = abduco.c
 OBJ = ${SRC:.c=.o}
 
 all: clean options abduco