diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 00000000..39a06683
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1 @@
+.deps
diff --git a/Dockerfile b/Dockerfile
index 5ae07007..48c15f75 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ ENV PKGPATH $GOPATH/src/github.com/prometheus/alertmanager
 ENV GOROOT  /usr/src/go
 
 ADD . $PKGPATH
-RUN cd $PKGPATH && go get -d && make
+RUN cd $PKGPATH && go get -d && make && rm -rf $PKGPATH/.deps
 
 USER       nobody
 WORKDIR    /alertmanager