diff --git a/system/nxlooper/nxlooper_main.c b/system/nxlooper/nxlooper_main.c
index ec4cd5601..b92b7d1b2 100644
--- a/system/nxlooper/nxlooper_main.c
+++ b/system/nxlooper/nxlooper_main.c
@@ -264,7 +264,7 @@ static int nxlooper_cmd_volume(FAR struct nxlooper_s *plooper, char *parg)
     {
       /* Get the percentage value from the argument */
 
-      percent = (uint16_t)(atof(parg) * 10.0);
+      percent = (uint16_t)(strtof(parg, NULL) * 10.0f);
       return nxlooper_setvolume(plooper, percent);
     }
 
diff --git a/system/nxplayer/nxplayer_main.c b/system/nxplayer/nxplayer_main.c
index 052fadab8..c1f7f9dc0 100644
--- a/system/nxplayer/nxplayer_main.c
+++ b/system/nxplayer/nxplayer_main.c
@@ -415,7 +415,7 @@ static int nxplayer_cmd_bass(FAR struct nxplayer_s *pplayer, char *parg)
     {
       /* Get the level and range percentage value from the argument */
 
-      level_percent = (uint8_t) atoi(parg);
+      level_percent = (uint8_t)strtoul(parg, NULL, 10);
       nxplayer_setbass(pplayer, level_percent);
     }
 
@@ -445,7 +445,7 @@ static int nxplayer_cmd_treble(FAR struct nxplayer_s *pplayer, char *parg)
     {
       /* Get the level and range percentage value from the argument */
 
-      level_percent = (uint8_t) atoi(parg);
+      level_percent = (uint8_t)strtoul(parg, NULL, 10);
       nxplayer_settreble(pplayer, level_percent);
     }
 
@@ -476,7 +476,7 @@ static int nxplayer_cmd_balance(FAR struct nxplayer_s *pplayer, char *parg)
     {
       /* Get the percentage value from the argument */
 
-      percent = (uint16_t) (atof(parg) * 10.0);
+      percent = (uint16_t)(strtof(parg, NULL) * 10.0f);
       nxplayer_setbalance(pplayer, percent);
     }