diff --git a/lib/utils/bitarray.c b/lib/utils/bitarray.c
index dfd7e6b9453..07f22e0c94b 100644
--- a/lib/utils/bitarray.c
+++ b/lib/utils/bitarray.c
@@ -620,7 +620,7 @@ found:
 	/* The bit we are looking for must be in the current bundle idx.
 	 * Find out the exact index of the bit.
 	 */
-	for (int j = 0; j <= bundle_bitness(bitarray) - 1; j++) {
+	for (size_t j = 0; j <= bundle_bitness(bitarray) - 1; j++) {
 		if (bitarray->bundles[idx] & mask & BIT(j)) {
 			if (--n <= 0) {
 				*found_at = idx * bundle_bitness(bitarray) + j;