diff --git a/scope b/scope
index caf15ede3..52ffba426 100755
--- a/scope
+++ b/scope
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 set -eu
 
@@ -77,7 +77,7 @@ check_not_running() {
 # Run `weave expose` if it's not already exposed.
 weave_expose() {
     status=$(weave ps weave:expose | awk '{print $3}' 2>/dev/null)
-    if [ "$status" == "" ]; then
+    if [ "$status" = "" ]; then
         weave expose
     fi
 }