diff --git a/sh4-dis.c b/sh4-dis.c
index 41fd8667b8..078a6b206b 100644
--- a/sh4-dis.c
+++ b/sh4-dis.c
@@ -1493,10 +1493,10 @@ print_insn_ppi (int field_b, struct disassemble_info *info)
 		  print_dsp_reg (field_b & 0xf, fprintf_fn, stream);
 		  break;
 		case DSP_REG_X:
-		  fprintf_fn (stream, sx_tab[(field_b >> 6) & 3]);
+		  fprintf_fn (stream, "%s", sx_tab[(field_b >> 6) & 3]);
 		  break;
 		case DSP_REG_Y:
-		  fprintf_fn (stream, sy_tab[(field_b >> 4) & 3]);
+		  fprintf_fn (stream, "%s", sy_tab[(field_b >> 4) & 3]);
 		  break;
 		case A_MACH:
 		  fprintf_fn (stream, "mach");