diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bf62fcadc066..cffaf02baf20 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2011-02-03  Jakub Jelinek  <jakub@redhat.com>
 
+	PR lto/47274
+	* lto-streamer-out.c (write_symbol): When writing kind and visibility,
+	copy them into a unsigned char variable and pass address of it to
+	lto_output_data_stream.
+
 	PR target/47564
 	* toplev.c (target_reinit): Save and restore *crtl and regno_reg_rtx
 	around backend_init_target and lang_dependent_init_target calls.
diff --git a/gcc/lto-streamer-out.c b/gcc/lto-streamer-out.c
index e471d70bbcd7..d1aac239f77b 100644
--- a/gcc/lto-streamer-out.c
+++ b/gcc/lto-streamer-out.c
@@ -2410,6 +2410,7 @@ write_symbol (struct lto_streamer_cache_d *cache,
   int slot_num;
   uint64_t size;
   const char *comdat;
+  unsigned char c;
 
   /* None of the following kinds of symbols are needed in the
      symbol table.  */
@@ -2505,8 +2506,10 @@ write_symbol (struct lto_streamer_cache_d *cache,
 
   lto_output_data_stream (stream, name, strlen (name) + 1);
   lto_output_data_stream (stream, comdat, strlen (comdat) + 1);
-  lto_output_data_stream (stream, &kind, 1);
-  lto_output_data_stream (stream, &visibility, 1);
+  c = (unsigned char) kind;
+  lto_output_data_stream (stream, &c, 1);
+  c = (unsigned char) visibility;
+  lto_output_data_stream (stream, &c, 1);
   lto_output_data_stream (stream, &size, 8);
   lto_output_data_stream (stream, &slot_num, 4);
 }