diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index ccb2c9190e2eff..373dd4e60bf33f 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -807,7 +807,6 @@ template <> struct MappingTraits<FormatStyle> {
         FormatStyle PredefinedStyle;
         if (getPredefinedStyle(StyleName, Style.Language, &PredefinedStyle) &&
             Style == PredefinedStyle) {
-          IO.mapOptional("# BasedOnStyle", StyleName);
           BasedOnStyle = StyleName;
           break;
         }