diff --git a/src/logger.gd b/src/logger.gd
index f05fe50..679cb64 100644
--- a/src/logger.gd
+++ b/src/logger.gd
@@ -59,7 +59,7 @@ func _log(level: CoreTypes.LoggerLevel, message: String) -> void:
 		CoreTypes.LoggerLevel.DIAG:
 			format = format.replace("%level%", "DIAG")
 			format_newline = format_newline.replace("%level%", "DIAG")
-			format.replace("%color%", "[color=dark_gray]")
+			format = format.replace("%color%", "[color=dark_gray]")
 		CoreTypes.LoggerLevel.VERB:
 			format = format.replace("%level%", "VERB")
 			format_newline = format_newline.replace("%level%", "VERB")