diff --git a/Makefile b/Makefile
index 665c601..aa039ab 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ all: eatmemory.c
 	$(CC) eatmemory.c -o eatmemory
 
 install: eatmemory
-	install -m 0755 eatmemory $(prefix)/usr/bin/eatmemory
+	install -m 0755 eatmemory $(PREFIX)/usr/bin/eatmemory
 
 clean:
 	rm -rf *o eatmemory