diff --git a/S3/s3_sys.c b/S3/s3_sys.c
index 878de1d9..0c30bc4d 100644
--- a/S3/s3_sys.c
+++ b/S3/s3_sys.c
@@ -272,7 +272,7 @@ int32 printf_sym (FILE *of, char *strg, t_addr addr, uint32 *val,
 {
 int32 c1, c2, group, len1, len2, inst, aaddr, baddr;
 int32 oplen, groupno, i, j, vpos, qbyte, da, m, n;
-char bld[128], bldaddr[96], boperand[32], aoperand[32];
+char bld[128], bldaddr[160], boperand[32], aoperand[32];
 int32 blk[16], blt[16];
 int32 blkadd;
 
@@ -575,7 +575,7 @@ switch (opcode[j].form) {                               /* Get operands based on
             if (isdigit(gbuf[0])) {
                 sscanf(gbuf, "%x", &r);
             } else {
-                for (i = 0; i < 16; i++) {
+                for (i = 0; i < 15; i++) {
                     if (strcmp(gbuf, regname[i]) == 0)
                         break;
                 }