diff --git a/src/Makefile b/src/Makefile
index 41d0ff45cf68a561b6305a88cf0a6ede62f704e4..ca4911c67a0aa098d9607591e5e16f4d3319cad6 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -79,7 +79,7 @@ endif
 REDIS_CC=$(QUIET_CC)$(CC) $(FINAL_CFLAGS)
 REDIS_LD=$(QUIET_LINK)$(CC) $(FINAL_LDFLAGS)
 
-PREFIX= /usr/local
+PREFIX=? /usr/local
 INSTALL_BIN= $(PREFIX)/bin
 INSTALL= cp -pf