diff --git a/config/vars.mk b/config/vars.mk
index 40ed384..a4c24c8 100644
--- a/config/vars.mk
+++ b/config/vars.mk
@@ -29,7 +29,7 @@ CUR_DIR := $(shell pwd)
 
 # NDK config
 NDK_DIR := "../android-ndk"
-$(shell "source $(CUR_DIR)/config/ndk.sh")
+$(shell ". $(CUR_DIR)/config/ndk.sh")
 
 ifeq ($(OS),Linux)
         TOOLCHAIN := $(NDK_DIR)/toolchains/llvm/prebuilt/darwin-x86_64