diff --git a/system/i2c/i2c_main.c b/system/i2c/i2c_main.c
index 448c57d42..a73245058 100644
--- a/system/i2c/i2c_main.c
+++ b/system/i2c/i2c_main.c
@@ -41,7 +41,8 @@
  * Private Function Prototypes
  ****************************************************************************/
 
-static int i2ccmd_help(FAR struct i2ctool_s *i2ctool, int argc, char **argv);
+static int i2ccmd_help(FAR struct i2ctool_s *i2ctool,
+                       int argc, FAR char **argv);
 static int i2ccmd_unrecognized(FAR struct i2ctool_s *i2ctool, int argc,
                                FAR char **argv);
 
@@ -96,7 +97,8 @@ const char g_i2cxfrerror[]    = "i2ctool: %s: Transfer failed: %d\n";
  * Name: i2ccmd_help
  ****************************************************************************/
 
-static int i2ccmd_help(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
+static int i2ccmd_help(FAR struct i2ctool_s *i2ctool, int argc,
+                       FAR char **argv)
 {
   const struct cmdmap_s *ptr;