diff --git a/nuttx-configs/px4fmu-v2/nsh/defconfig b/nuttx-configs/px4fmu-v2/nsh/defconfig
index 1db47af50b..8818c5ae95 100644
--- a/nuttx-configs/px4fmu-v2/nsh/defconfig
+++ b/nuttx-configs/px4fmu-v2/nsh/defconfig
@@ -1336,7 +1336,8 @@ 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