diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000000000..191381ee74dec
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1 @@
+.git
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index a6537be6e57f2..0e9c3f241a27d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ COPY . /go/src/github.com/pingcap/tidb
 RUN cd /go/src/github.com/pingcap/tidb && \
     make godep && make server && \
     cp tidb-server/tidb-server /go/bin/ && \
-    rm -rf /go/src/*
+    make clean
 
 EXPOSE 4000