--- a/libcpu/i386_disasm.c	2015-08-21 14:22:37.000000000 +0200
+++ b/libcpu/i386_disasm.c	2015-11-20 06:30:59.250629957 +0100
@@ -710,6 +710,7 @@
 
 		case 'm':
 		  /* Mnemonic.  */
+		  str = mnebuf;
 
 		  if (unlikely (instrtab[cnt].mnemonic == MNE_INVALID))
 		    {