diff --git a/OpenRA.Game/MiniYaml.cs b/OpenRA.Game/MiniYaml.cs
index 7ee942cb1a..738d8a779c 100755
--- a/OpenRA.Game/MiniYaml.cs
+++ b/OpenRA.Game/MiniYaml.cs
@@ -112,7 +112,7 @@ namespace OpenRA
 				}
 				catch (ArgumentException ex)
 				{
-					throw new InvalidDataException("Duplicate key `{0}' in {1}".F(y.Key, y.Location), ex);
+					throw new InvalidDataException("Duplicate key '{0}' in {1}".F(y.Key, y.Location), ex);
 				}
 			}
 			return ret;