diff --git a/tests/drivers/flash/common/src/main.c b/tests/drivers/flash/common/src/main.c
index f7f7c6ee64e..a30f533f655 100644
--- a/tests/drivers/flash/common/src/main.c
+++ b/tests/drivers/flash/common/src/main.c
@@ -397,8 +397,10 @@ static void test_flash_copy_inner(const struct device *src_dev, off_t src_offset
 
 	if ((expected_result == 0) && (size != 0) && (src_offset != dst_offset)) {
 		/* verify a successful copy */
-		zassert_ok(flash_read(flash_dev, TEST_AREA_OFFSET, expected, EXPECTED_SIZE));
-		for (int i = 0; i < EXPECTED_SIZE; i++) {
+		off_t copy_size = MIN(size, EXPECTED_SIZE);
+
+		zassert_ok(flash_read(flash_dev, TEST_AREA_OFFSET, expected, copy_size));
+		for (int i = 0; i < copy_size; i++) {
 			zassert_equal(buf[i], 0xaa, "incorrect data (%02x) at %d", buf[i], i);
 		}
 	}