diff --git a/Makefile b/Makefile
index 7b0c062..a9c9ee2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
-PROG_NAME=args_count
-PREFIX=/usr/local
+PROG_NAME = args_count
+PREFIX ?= /usr/local
 
 all:
 	$(CC) ./src/$(PROG_NAME).c -o $(PROG_NAME)