diff --git a/test/ENABLE_POP3.bats b/test/ENABLE_POP3.bats
index a39ce94b..53aaf0d5 100644
--- a/test/ENABLE_POP3.bats
+++ b/test/ENABLE_POP3.bats
@@ -1,7 +1,7 @@
 @test "checking pop: server is ready" {
   run docker exec mail /bin/bash -c "nc -w 1 0.0.0.0 110 | grep '+OK'"
 
-  if [ $ENABLE_POP -eq 1 ]; then
+  if [ "$ENABLE_POP" -eq 1 ]; then
     [ "$status" -eq 0 ]
   else
     [ "$status" -eq 1 ]
@@ -11,7 +11,7 @@
 @test "checking pop: authentication works" {
   run docker exec mail /bin/sh -c "nc -w 1 0.0.0.0 110 < /tmp/docker-mailserver-test/auth/pop3-auth.txt"
 
-  if [ $ENABLE_POP -eq 1 ]; then
+  if [ "$ENABLE_POP" -eq 1 ]; then
     [ "$status" -eq 0 ]
   else
     [ "$status" -eq 1 ]