diff --git a/dumb/src/it/readokt.c b/dumb/src/it/readokt.c
index 078929c5c3..b662e55c44 100644
--- a/dumb/src/it/readokt.c
+++ b/dumb/src/it/readokt.c
@@ -486,7 +486,7 @@ static DUMB_IT_SIGDATA *it_okt_load_sigdata(DUMBFILE *f)
 
 	/* And finally, the sample data */
 	k = get_chunk_count(mod, DUMB_ID('S','B','O','D'));
-	for (i = 0, j = 0; i < (unsigned)sigdata->n_samples, j < k; i++) {
+	for (i = 0, j = 0; i < (unsigned)sigdata->n_samples && j < k; i++) {
 		if (sigdata->sample[i].flags & IT_SAMPLE_EXISTS) {
 			chunk = get_chunk_by_type(mod, DUMB_ID('S','B','O','D'), j);
 			if (it_okt_read_sample_data(&sigdata->sample[i], (const char *)chunk->data, chunk->size)) {
@@ -503,7 +503,7 @@ static DUMB_IT_SIGDATA *it_okt_load_sigdata(DUMBFILE *f)
 
 	chunk = get_chunk_by_type(mod, DUMB_ID('C','M','O','D'), 0);
 
-	for (i = 0, j = 0; i < n_channels, j < 4; j++) {
+	for (i = 0, j = 0; i < n_channels && j < 4; j++) {
 		k = (chunk->data[j * 2] << 8) | chunk->data[j * 2 + 1];
 		l = (j == 1 || j == 2) ? 48 : 16;
 		if (k == 0) {