diff --git a/nuttx-configs/px4fmu-v4/nsh/defconfig b/nuttx-configs/px4fmu-v4/nsh/defconfig
index f9ac65f8b4..024e5cdb31 100644
--- a/nuttx-configs/px4fmu-v4/nsh/defconfig
+++ b/nuttx-configs/px4fmu-v4/nsh/defconfig
@@ -1338,7 +1338,8 @@ CONFIG_LIBC_STRERROR=y
 #
 # memcpy/memset Options
 #
-# CONFIG_MEMSET_OPTSPEED is not set
+CONFIG_MEMSET_OPTSPEED=y
+CONFIG_MEMSET_64BIT=y
 # CONFIG_LIBC_DLLFCN is not set
 # CONFIG_LIBC_MODLIB is not set
 # CONFIG_LIBC_WCHAR is not set