diff --git a/gdb/x86-64-tdep.c b/gdb/x86-64-tdep.c
index 8bb507cd48..a93af05dc8 100644
--- a/gdb/x86-64-tdep.c
+++ b/gdb/x86-64-tdep.c
@@ -788,7 +788,8 @@ x86_64_store_return_value (struct type *type, struct regcache *regcache,
   else if (TYPE_CODE_FLT == TYPE_CODE (type))
     {
       /* Handle double and float variables.  */
-      regcache_cooked_write_part (regcache, X86_64_XMM0_REGNUM, 0, len, buf);
+      regcache_cooked_write_part (regcache, X86_64_XMM0_REGNUM,
+				  0, len, valbuf);
     }
   /* XXX: What about complex floating point types?  */
   else