diff --git a/disas/m68k.c b/disas/m68k.c
index 1f16e295ab..800b4145ac 100644
--- a/disas/m68k.c
+++ b/disas/m68k.c
@@ -1000,7 +1000,7 @@ print_indexed (int basereg,
 
   /* Generate the text for the index register.
      Where this will be output is not yet determined.  */
-  sprintf (buf, "%s:%c%s",
+  snprintf(buf, sizeof(buf), "%s:%c%s",
 	   reg_names[(word >> 12) & 0xf],
 	   (word & 0x800) ? 'l' : 'w',
 	   scales[(word >> 9) & 3]);