diff --git a/muranodashboard/services/ActiveDirectory.yaml b/muranodashboard/services/ActiveDirectory.yaml
index 66f6648d9..29d2caa13 100644
--- a/muranodashboard/services/ActiveDirectory.yaml
+++ b/muranodashboard/services/ActiveDirectory.yaml
@@ -91,7 +91,7 @@ forms:
           helpText: Optional field for a machine hostname template
       validators:
         # if unitNamingPattern is given and dcInstances > 1, then '#' should occur in unitNamingPattern
-        - expr: {YAQL: $.serviceConfiguration.dcInstances < 2 or not $.serviceConfiguration.unitNamingPattern.bool() or '#' in $.serviceConfiguration.unitNamingPattern}
+        - expr: {YAQL: $.serviceConfiguration.dcInstances < 2 or not $.serviceConfiguration.unitNamingPattern.bool() or ('#' in $.serviceConfiguration.unitNamingPattern)}
           message: Incrementation symbol "#" is required in the Hostname template
   - instanceConfiguration:
       fields:
diff --git a/muranodashboard/services/AspNetAppFarm.yaml b/muranodashboard/services/AspNetAppFarm.yaml
index 545ed2cf0..17ae64413 100644
--- a/muranodashboard/services/AspNetAppFarm.yaml
+++ b/muranodashboard/services/AspNetAppFarm.yaml
@@ -94,7 +94,7 @@ forms:
           helpText: Optional field for a machine hostname template
       validators:
         # if unitNamingPattern is given and dcInstances > 1, then '#' should occur in unitNamingPattern
-        - expr: {YAQL: not $.serviceConfiguration.unitNamingPattern.bool() or '#' in $.serviceConfiguration.unitNamingPattern}
+        - expr: {YAQL: not $.serviceConfiguration.unitNamingPattern.bool() or ('#' in $.serviceConfiguration.unitNamingPattern)}
           message: Incrementation symbol "#" is required in the Hostname template
   - instanceConfiguration:
       fields:
diff --git a/muranodashboard/services/WebServerFarm.yaml b/muranodashboard/services/WebServerFarm.yaml
index 13f331af5..d52e318cf 100644
--- a/muranodashboard/services/WebServerFarm.yaml
+++ b/muranodashboard/services/WebServerFarm.yaml
@@ -81,7 +81,7 @@ forms:
           helpText: Optional field for a machine hostname template
       validators:
         # if unitNamingPattern is given and dcInstances > 1, then '#' should occur in unitNamingPattern
-        - expr: {YAQL: not $.serviceConfiguration.unitNamingPattern.bool() or '#' in $.serviceConfiguration.unitNamingPattern}
+        - expr: {YAQL: not $.serviceConfiguration.unitNamingPattern.bool() or ('#' in $.serviceConfiguration.unitNamingPattern)}
           message: Incrementation symbol "#" is required in the Hostname template
   - instanceConfiguration:
       fields: