diff --git a/boards/arm/lpc17xx_40xx/u-blox-c027/src/lpc17_40_ubxmdm.c b/boards/arm/lpc17xx_40xx/u-blox-c027/src/lpc17_40_ubxmdm.c
index 7937d4353cb..48036a97de7 100644
--- a/boards/arm/lpc17xx_40xx/u-blox-c027/src/lpc17_40_ubxmdm.c
+++ b/boards/arm/lpc17xx_40xx/u-blox-c027/src/lpc17_40_ubxmdm.c
@@ -267,7 +267,7 @@ static int lpc17_40_ioctl(FAR struct ubxmdm_lower* lower,
 {
   /* No platform-specific IOCTL at the moment. */
 
-  return -ENOSYS;
+  return -ENOTTY;
 }
 
 /****************************************************************************