diff --git a/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_bringup.c b/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_bringup.c
index 578b5401352..7fa7b7590f7 100644
--- a/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_bringup.c
+++ b/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_bringup.c
@@ -358,6 +358,7 @@ static int nsh_usbhostinitialize(void)
       return pid < 0 ? -ENOEXEC : OK;
     }
 
+  UNUSED(ret);
   return -ENODEV;
 }
 #else
diff --git a/drivers/usbdev/cdcecm.c b/drivers/usbdev/cdcecm.c
index 7060dc976f4..d769f5288fa 100644
--- a/drivers/usbdev/cdcecm.c
+++ b/drivers/usbdev/cdcecm.c
@@ -1065,10 +1065,6 @@ static void cdcecm_ipv6multicast(FAR struct cdcecm_driver_s *priv)
 static int cdcecm_ioctl(FAR struct net_driver_s *dev, int cmd,
                       unsigned long arg)
 {
-  FAR struct cdcecm_driver_s *priv =
-    (FAR struct cdcecm_driver_s *)dev->d_private;
-  int ret;
-
   /* Decode and dispatch the driver-specific IOCTL command */
 
   switch (cmd)
diff --git a/fs/partition/fs_ptable.c b/fs/partition/fs_ptable.c
index 366d9522bf1..583deeab4e6 100644
--- a/fs/partition/fs_ptable.c
+++ b/fs/partition/fs_ptable.c
@@ -37,6 +37,8 @@
  * Included Files
  ****************************************************************************/
 
+#include <string.h>
+
 #include <nuttx/kmalloc.h>
 
 #include "partition.h"