diff --git a/test/test_specific-ports/test_specified_all.yml b/test/test_specific-ports/test_specified_all.yml
index 0822863..188ecc2 100644
--- a/test/test_specific-ports/test_specified_all.yml
+++ b/test/test_specific-ports/test_specified_all.yml
@@ -5,7 +5,7 @@ web:
   environment:
     WEB_PORTS: 81
     VIRTUAL_HOST: webA.nginx-proxy.tld:5000,webB.nginx-proxy.tld:5001
-    VIRTUAL_HOST_SPECIFIC_PORT: true
+    VIRTUAL_HOST_SPECIFIC_PORT: "true"
 
 
 sut:
diff --git a/test/test_specific-ports/test_specified_none.yml b/test/test_specific-ports/test_specified_none.yml
index 1f7ad2b..4259e27 100644
--- a/test/test_specific-ports/test_specified_none.yml
+++ b/test/test_specific-ports/test_specified_none.yml
@@ -5,7 +5,7 @@ web:
   environment:
     WEB_PORTS: 81
     VIRTUAL_HOST: webA.nginx-proxy.tld,webB.nginx-proxy.tld
-    VIRTUAL_HOST_SPECIFIC_PORT: true
+    VIRTUAL_HOST_SPECIFIC_PORT: "true"
 
 
 sut: