diff --git a/tools/reader/Makefile b/tools/reader/Makefile
index 6b5ed87..a5281de 100644
--- a/tools/reader/Makefile
+++ b/tools/reader/Makefile
@@ -13,7 +13,7 @@ CFLAGS = -Wall -O2
 EXE = obreader
 FILES = obreader.c
 
-$(ARCH)-$(EXE):
+$(ARCH)-$(EXE): $(FILES)
 	$(CC) $(CFLAGS) -o $@ $(FILES)
 	$(STRIP) $@
 
@@ -22,9 +22,10 @@ $(ARCH)-$(EXE):
 # <URL:http://wiki.openwrt.org/doc/devel/crosscompile>
 # for setup instructions.
 WRT=~/r0ket/openwrt/trunk/staging_dir
+STAGING_DIR=$(WRT)/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2
 
 mips:
-	STAGING_DIR=$(WRT)/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2 \
+	STAGING_DIR=$(STAGING_DIR) \
 	PATH=${PATH}:$(STAGING_DIR)/bin \
 	$(MAKE) TUPLE=mips-openwrt-linux