diff --git a/lib/os/bitarray.c b/lib/os/bitarray.c
index 831567c7c49..7213ae201f5 100644
--- a/lib/os/bitarray.c
+++ b/lib/os/bitarray.c
@@ -132,7 +132,7 @@ static bool match_region(sys_bitarray_t *bitarray, size_t offset,
 
 		if (bundle != 0U) {
 			/* Bits in "between bundles" do not match */
-			mismatch_bundle = ~bundle;
+			mismatch_bundle = bundle;
 			mismatch_bundle_idx = idx;
 			goto mismatch;
 		}
diff --git a/tests/kernel/common/src/bitarray.c b/tests/kernel/common/src/bitarray.c
index 984ca1e79d9..05dd12c5343 100644
--- a/tests/kernel/common/src/bitarray.c
+++ b/tests/kernel/common/src/bitarray.c
@@ -335,6 +335,23 @@ void alloc_and_free_predefined(void)
 	zassert_equal(ret, 0, "sys_bitarray_free() failed: %d", ret);
 	zassert_true(cmp_u32_arrays(ba_128.bundles, ba_128_expected, ba_128.num_bundles),
 		     "sys_bitarray_free() failed bits comparison");
+
+	/* test in-between bundles */
+	ba_128.bundles[0] = 0x7FFFFFFF;
+	ba_128.bundles[1] = 0xFFFFFFFF;
+	ba_128.bundles[2] = 0x00000000;
+	ba_128.bundles[3] = 0x00000000;
+
+	ba_128_expected[0] = 0x7FFFFFFF;
+	ba_128_expected[1] = 0xFFFFFFFF;
+	ba_128_expected[2] = 0xFFFFFFFF;
+	ba_128_expected[3] = 0x00000003;
+
+	ret = sys_bitarray_alloc(&ba_128, 34, &offset);
+	zassert_equal(ret, 0, "sys_bitarray_alloc() failed: %d", ret);
+	zassert_equal(offset, 64, "sys_bitarray_alloc() offset expected %d, got %d", 64, offset);
+	zassert_true(cmp_u32_arrays(ba_128.bundles, ba_128_expected, ba_128.num_bundles),
+		     "sys_bitarray_alloc() failed bits comparison");
 }
 
 static inline size_t count_bits(uint32_t val)
@@ -613,6 +630,34 @@ ZTEST(bitarray, test_bitarray_region_set_clear)
 	zassert_equal(ret, -EINVAL, "sys_bitarray_clear_region() should fail but not");
 	zassert_true(cmp_u32_arrays(ba.bundles, ba_expected, ba.num_bundles),
 		     "sys_bitarray_clear_region() failed bits comparison");
+
+	SYS_BITARRAY_DEFINE(bw, 128);
+
+	/* Pre-populate the bits */
+	bw.bundles[0] = 0xFF0F0F0F;
+	bw.bundles[1] = 0xF0000000;
+	bw.bundles[2] = 0xFFFFFFFF;
+	bw.bundles[3] = 0x0000000F;
+
+	zassert_true(sys_bitarray_is_region_set(&bw, 40, 60));
+	zassert_false(sys_bitarray_is_region_cleared(&bw, 40, 60));
+
+	bw.bundles[2] = 0xFFFEEFFF;
+
+	zassert_false(sys_bitarray_is_region_set(&bw, 40, 60));
+	zassert_false(sys_bitarray_is_region_cleared(&bw, 40, 60));
+
+	bw.bundles[1] = 0x0FFFFFFF;
+	bw.bundles[2] = 0x00000000;
+	bw.bundles[3] = 0xFFFFFFF0;
+
+	zassert_true(sys_bitarray_is_region_cleared(&bw, 40, 60));
+	zassert_false(sys_bitarray_is_region_set(&bw, 40, 60));
+
+	bw.bundles[2] = 0x00011000;
+
+	zassert_false(sys_bitarray_is_region_cleared(&bw, 40, 60));
+	zassert_false(sys_bitarray_is_region_set(&bw, 40, 60));
 }
 
 /**