diff --git a/src/crystal/once.cr b/src/crystal/once.cr
index 32458a84992b..4ed3a699b186 100644
--- a/src/crystal/once.cr
+++ b/src/crystal/once.cr
@@ -16,8 +16,8 @@ module Crystal
   module Once
     enum State : Int8
       Processing    = -1
-      Uninitialized = 0
-      Initialized   = 1
+      Uninitialized =  0
+      Initialized   =  1
     end
 
     {% if compare_versions(Crystal::VERSION, "1.16.0-dev") >= 0 %}