diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index 4a7e4801cebfa2..e177f4022d400f 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -39,7 +39,7 @@ int iioutils_break_up_name(const char *full_name, char **generic_name)
 	char *working, *prefix = "";
 	int i, ret;
 
-	for (i = 0; i < sizeof(iio_direction) / sizeof(iio_direction[0]); i++)
+	for (i = 0; i < ARRAY_SIZE(iio_direction); i++)
 		if (!strncmp(full_name, iio_direction[i],
 			     strlen(iio_direction[i]))) {
 			prefix = iio_direction[i];
diff --git a/tools/iio/iio_utils.h b/tools/iio/iio_utils.h
index 086610139ade32..f30a1091b53e68 100644
--- a/tools/iio/iio_utils.h
+++ b/tools/iio/iio_utils.h
@@ -18,6 +18,8 @@
 #define FORMAT_SCAN_ELEMENTS_DIR "%s/scan_elements"
 #define FORMAT_TYPE_FILE "%s_type"
 
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
+
 extern const char *iio_dir;
 
 /**