diff --git a/libcxx/include/module.modulemap.in b/libcxx/include/module.modulemap.in
--- a/libcxx/include/module.modulemap.in
+++ b/libcxx/include/module.modulemap.in
@@ -992,10 +992,7 @@
         export locale
       }
       module format_error                    { private header "__format/format_error.h" }
-      module format_functions                {
-        private header "__format/format_functions.h"
-        export string
-      }
+      module format_functions                { private header "__format/format_functions.h" }
       module format_fwd                      { private header "__format/format_fwd.h" }
       module format_parse_context            { private header "__format/format_parse_context.h" }
       module format_string                   { private header "__format/format_string.h" }