diff --git a/rtlibc.mk b/rtlibc.mk
index ca44ee1..e0ecee5 100644
--- a/rtlibc.mk
+++ b/rtlibc.mk
@@ -1,4 +1,4 @@
-RTLIBC_PATH := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
+RTLIBC_PATH := $(dir $(abspath $(lastword $(MAKEFILE_LIST)))).
 
 CSRCS += \
 $(RTLIBC_PATH)/src/iprintf.c \