diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9493159e2de..791a5c8936a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-12-04  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	PR middle-end/51351
+	* optabs.c (init_sync_libfuncs): Use "or" rather than "ior"
+	in the external names.
+
 2011-12-03  Jack Howarth <howarth@bromo.med.uc.edu>
 
 	* config/darwin10.h (LINK_GCC_C_SEQUENCE_SPEC):
diff --git a/gcc/optabs.c b/gcc/optabs.c
index c3f81dfe2d2..4f5340e589e 100644
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -6624,14 +6624,14 @@ init_sync_libfuncs (int max)
 
   init_sync_libfuncs_1 (sync_old_add_optab, "__sync_fetch_and_add", max);
   init_sync_libfuncs_1 (sync_old_sub_optab, "__sync_fetch_and_sub", max);
-  init_sync_libfuncs_1 (sync_old_ior_optab, "__sync_fetch_and_ior", max);
+  init_sync_libfuncs_1 (sync_old_ior_optab, "__sync_fetch_and_or", max);
   init_sync_libfuncs_1 (sync_old_and_optab, "__sync_fetch_and_and", max);
   init_sync_libfuncs_1 (sync_old_xor_optab, "__sync_fetch_and_xor", max);
   init_sync_libfuncs_1 (sync_old_nand_optab, "__sync_fetch_and_nand", max);
 
   init_sync_libfuncs_1 (sync_new_add_optab, "__sync_add_and_fetch", max);
   init_sync_libfuncs_1 (sync_new_sub_optab, "__sync_sub_and_fetch", max);
-  init_sync_libfuncs_1 (sync_new_ior_optab, "__sync_ior_and_fetch", max);
+  init_sync_libfuncs_1 (sync_new_ior_optab, "__sync_or_and_fetch", max);
   init_sync_libfuncs_1 (sync_new_and_optab, "__sync_and_and_fetch", max);
   init_sync_libfuncs_1 (sync_new_xor_optab, "__sync_xor_and_fetch", max);
   init_sync_libfuncs_1 (sync_new_nand_optab, "__sync_nand_and_fetch", max);