diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 39fd47a378e..c02d742d719 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -33,6 +33,10 @@
 	(MIPS_CPU_STRING_DEFAULT): Undef before defining.
 	(MULTILIB_DEFAULTS, MIPS_ABI_DEFAULT, SUBTARGET_CC1_SPEC): Likewise.
 
+	PR target/47135
+	* config/pdp11/pdp11.c (pdp11_asm_print_operand_punct_valid_p): Change
+	type to match target.def .
+
 2010-12-30  Mingjie Xing  <mingjie.xing@gmail.com>
 
 	* config/mips/mips.h (SHIFT_COUNT_TRUNCATED): Change
diff --git a/gcc/config/pdp11/pdp11.c b/gcc/config/pdp11/pdp11.c
index 21f97d2127d..b6ed97989fc 100644
--- a/gcc/config/pdp11/pdp11.c
+++ b/gcc/config/pdp11/pdp11.c
@@ -770,7 +770,7 @@ pdp11_asm_print_operand (FILE *file, rtx x, int code)
 }
 
 static bool
-pdp11_asm_print_operand_punct_valid_p (char c)
+pdp11_asm_print_operand_punct_valid_p (unsigned char c)
 {
   return (c == '#' || c == '@');
 }