diff --git a/deployment/cinder/cinder-api-container-puppet.yaml b/deployment/cinder/cinder-api-container-puppet.yaml
index f059da10d0..b3a5de59bd 100644
--- a/deployment/cinder/cinder-api-container-puppet.yaml
+++ b/deployment/cinder/cinder-api-container-puppet.yaml
@@ -55,10 +55,9 @@ parameters:
     description: The name of Cinder's default volume type.
     type: string
     constraints:
-    - allowed_pattern: "[a-zA-Z0-9]+"
+    - allowed_pattern: ".*\\S.*"
       description: >
-        The default volume type must be at least 1 character and contain only
-        letters and numbers.
+        The default volume type name cannot be empty.
   CinderEnableDBPurge:
     default: true
     description: |