diff --git a/build.bash b/build.bash
index fd3afb6..4cb04ed 100755
--- a/build.bash
+++ b/build.bash
@@ -4,8 +4,13 @@ set -eu
 
 cd "$(dirname "$0")"
 
-# GOPATH may contain multiple paths separated by ":"
-GOPATH1=$(echo $GOPATH | cut -f1 -d:)
+# Starting with Go v1.8, GOPATH may be unset. $HOME/go is used instead.
+if [[ -z ${GOPATH:-} ]] ; then
+	GOPATH1=$HOME/go
+else
+	# GOPATH may contain multiple paths separated by ":"
+	GOPATH1=$(echo $GOPATH | cut -f1 -d:)
+fi
 
 # gocryptfs version according to git
 GITVERSION=$(git describe --tags --dirty)