diff --git a/OpenRA.Mods.Common/UtilityCommands/CheckYaml.cs b/OpenRA.Mods.Common/UtilityCommands/CheckYaml.cs
index 73da3275fa..30922a8537 100644
--- a/OpenRA.Mods.Common/UtilityCommands/CheckYaml.cs
+++ b/OpenRA.Mods.Common/UtilityCommands/CheckYaml.cs
@@ -77,7 +77,7 @@ namespace OpenRA.Mods.Common.UtilityCommands
 						}
 						catch (Exception e)
 						{
-							EmitError("{0} failed with exception: {0}".F(customPassType, e));
+							EmitError("{0} failed with exception: {1}".F(customPassType, e));
 						}
 					}
 				}