diff --git a/src/platforms/qurt/px4_layer/px4_qurt_impl.cpp b/src/platforms/qurt/px4_layer/px4_qurt_impl.cpp
index 12b4c2667e..d9e0f7842c 100644
--- a/src/platforms/qurt/px4_layer/px4_qurt_impl.cpp
+++ b/src/platforms/qurt/px4_layer/px4_qurt_impl.cpp
@@ -123,7 +123,7 @@ void init(int argc, char *argv[], const char *app_name)
 ssize_t
 dm_read(
 	dm_item_t item,                 /* The item type to retrieve */
-	unsigned char index,            /* The index of the item */
+	unsigned index,                 /* The index of the item */
 	void *buffer,                   /* Pointer to caller data buffer */
 	size_t buflen                   /* Length in bytes of data to retrieve */
 )
@@ -135,7 +135,7 @@ dm_read(
 ssize_t
 dm_write(
 	dm_item_t  item,                /* The item type to store */
-	unsigned char index,            /* The index of the item */
+	unsigned index,                 /* The index of the item */
 	dm_persitence_t persistence,    /* The persistence level of this item */
 	const void *buffer,             /* Pointer to caller data buffer */
 	size_t buflen                   /* Length in bytes of data to retrieve */