diff --git a/etherslurp/Makefile b/etherslurp/Makefile
index cdb0e9248..071466fae 100644
--- a/etherslurp/Makefile
+++ b/etherslurp/Makefile
@@ -1,9 +1,13 @@
+ifndef GOPATH
+$(error GOPATH is not set)
+endif
+
 T=$(GOPATH)/src/github.com/google/trillian
 E=$(GOPATH)/src/github.com/google/trillian-examples/etherslurp
 G=$(GOPATH)/src/github.com/ethereum/go-ethereum/build/bin/geth
 
 trillian::
-	go get -u github.com/google/trillian
+	go get -u -d -t github.com/google/trillian/...
 	cd $T && \
 	go build ./server/trillian_log_server && \
 	go build ./server/trillian_log_signer && \
diff --git a/etherslurp/README.md b/etherslurp/README.md
index 24cc6a735..857a377bd 100644
--- a/etherslurp/README.md
+++ b/etherslurp/README.md
@@ -5,7 +5,7 @@
 Check out this repo (using Go), and cd to it:
 
 ```bash
-go get -ud github.com/google/trillian-examples/etherslurp
+go get -u -d -t github.com/google/trillian-examples/etherslurp/...
 # the warning "package github.com/google/trillian-examples/etherslurp: no Go files in .../src/github.com/google/trillian-examples/etherslurp" is expected
 # All terminals need to start in this directory
 cd $GOPATH/src/github.com/google/trillian-examples/etherslurp