diff --git a/src/Aspire.Hosting.Azure/Provisioning/Provisioners/BicepProvisioner.cs b/src/Aspire.Hosting.Azure/Provisioning/Provisioners/BicepProvisioner.cs
index 30bf2cfc608..4bf6e9f308c 100644
--- a/src/Aspire.Hosting.Azure/Provisioning/Provisioners/BicepProvisioner.cs
+++ b/src/Aspire.Hosting.Azure/Provisioning/Provisioners/BicepProvisioner.cs
@@ -121,17 +121,18 @@ await notificationService.PublishUpdateAsync(resource, state => state with
 
         var resourceLogger = loggerService.GetLogger(resource);
 
-        PopulateWellKnownParameters(resource, context);
-
         if (FindFullPathFromPath("az") is not { } azPath)
         {
             throw new AzureCliNotOnPathException();
         }
 
         var template = resource.GetBicepTemplateFile();
-
         var path = template.Path;
 
+        // GetBicepTemplateFile may have added new well-known parameters, so we need
+        // to populate them only after calling GetBicepTemplateFile.
+        PopulateWellKnownParameters(resource, context);
+
         KeyVaultResource? keyVault = null;
 
         if (resource.Parameters.ContainsKey(AzureBicepResource.KnownParameters.KeyVaultName))