diff --git a/examples/sixdraw.c b/examples/sixdraw.c
index 12a9891..5fecf54 100644
--- a/examples/sixdraw.c
+++ b/examples/sixdraw.c
@@ -279,7 +279,7 @@ sixdraw_prepare(struct sixdraw_ctx *ctx)
     bool has_sixel = false;
     bool has_dec_locator = false;
     union ctlseqs_value *result = ctx->result;
-    for (size_t i = 1; i <= result[0].num; ++i) {
+    for (size_t i = 1; i <= result[0].len; ++i) {
         if (result[i].num == 4) {
             has_sixel = true;
         } else if (result[i].num == 29) {
diff --git a/src/ctlseqs.c b/src/ctlseqs.c
index cbfc47c..5046497 100644
--- a/src/ctlseqs.c
+++ b/src/ctlseqs.c
@@ -74,7 +74,7 @@
             break;                      \
         }                               \
     }                                   \
-    buf_val[0].num = cnt;               \
+    buf_val[0].len = cnt;               \
     buf_val[1].str = seq;               \
     *buf += 2;                          \
     return seq + cnt
@@ -250,7 +250,8 @@ ctlseqs_state_transition(enum ctlseqs_state state, char ch)
 CTLSEQS_HOT static char const *
 ctlseqs_fetch_value(char const *seq, int type, union ctlseqs_value **buf)
 {
-    unsigned long cnt, num;
+    size_t cnt;
+    unsigned long num;
     char *endptr = NULL;
     union ctlseqs_value *buf_val = *buf;
     switch (type) {
@@ -269,7 +270,7 @@ ctlseqs_fetch_value(char const *seq, int type, union ctlseqs_value **buf)
                 }
                 seq = endptr + 1;
             }
-            buf_val[0].num = cnt;
+            buf_val[0].len = cnt;
             *buf += cnt + 1;
             return endptr;
         case ctlseqs_ph_str:
@@ -365,7 +366,7 @@ ctlseqs_do_match(struct ctlseqs_matcher const *matcher, struct ctlseqs_match_arg
         }
     }
     if (retval < 0 || args->save_seq) {
-        args->result[0].num = idx;
+        args->result[0].len = idx;
         args->result[1].str = seq;
     }
     args->result_idx = idx;
diff --git a/src/ctlseqs.h b/src/ctlseqs.h
index 0976f18..d8f0d6c 100644
--- a/src/ctlseqs.h
+++ b/src/ctlseqs.h
@@ -388,6 +388,7 @@ struct ctlseqs_reader_options {
 
 union ctlseqs_value {
     char const    *str;
+    size_t         len;
     unsigned long  num;
 };
 
diff --git a/tests/tcsgrep.c b/tests/tcsgrep.c
index ed8b1a9..519dac2 100644
--- a/tests/tcsgrep.c
+++ b/tests/tcsgrep.c
@@ -87,7 +87,7 @@ parse_int(char const *str, int *dest)
 static void
 print_generic_seq(char const *header, union ctlseqs_value *result, bool newline)
 {
-    size_t length = result[0].num;
+    size_t length = result[0].len;
     char const *seq = result[1].str;
     printf("%s %zu", header, length);
     for (size_t idx = 0; idx < length; ++idx) {
@@ -124,10 +124,10 @@ print_matching_seq(struct tcsgrep_sequence *seq, union ctlseqs_value *result, bo
                 printf(" %lu", result[idx].num);
                 break;
             case 0x10:  // CTLSEQS_PH_STR
-                printf(" %.*s", (int)result[idx].num, result[idx + 1].str);
+                printf(" %.*s", (int)result[idx].len, result[idx + 1].str);
                 break;
             case 0x0f:  // CTLSEQS_PH_NUMS
-                for (size_t i = 1; i <= result[idx].num; ++i) {
+                for (size_t i = 1; i <= result[idx].len; ++i) {
                     printf(" %lu", result[idx + i].num);
                 }
                 break;
@@ -421,7 +421,7 @@ main(int argc, char **argv)
             case CTLSEQS_NOMEM:
                 print_generic_seq("NOMEM", result, true);
                 if (ctx.purge_long_seqs) {
-                    ctlseqs_purge(reader, result[0].num);
+                    ctlseqs_purge(reader, result[0].len);
                     break;
                 } else {
                     status = 1;