diff --git a/util/ceg/assemble/as_assemble/assemble.c b/util/ceg/assemble/as_assemble/assemble.c
index 691613bb3..8306a4d90 100644
--- a/util/ceg/assemble/as_assemble/assemble.c
+++ b/util/ceg/assemble/as_assemble/assemble.c
@@ -40,6 +40,8 @@ char *str;
 					str = str + 2;
 				}
 				break;
+		  case '%':	*b_ptr++ = *str;
+				/* fall through */
 		  default  :    *b_ptr++ = *str++;
 		}
 	}