diff --git a/drivers/iio/test/iio-test-format.c b/drivers/iio/test/iio-test-format.c
index 55a0cfe9181d23cdd1543de7ba296c6e327713a2..f1e951eddb43bad1cf72be87e1b44035e65484c7 100644
--- a/drivers/iio/test/iio-test-format.c
+++ b/drivers/iio/test/iio-test-format.c
@@ -8,7 +8,7 @@
 #include <linux/iio/iio.h>
 
 #define IIO_TEST_FORMAT_EXPECT_EQ(_test, _buf, _ret, _val) do { \
-		KUNIT_EXPECT_EQ(_test, (int)strlen(_buf), _ret); \
+		KUNIT_EXPECT_EQ(_test, strlen(_buf), _ret); \
 		KUNIT_EXPECT_STREQ(_test, (_buf), (_val)); \
 	} while (0)