diff --git a/arch/sim/src/nuttx-names.dat b/arch/sim/src/nuttx-names.dat
index b063c2a279..5e8f3a80d5 100644
--- a/arch/sim/src/nuttx-names.dat
+++ b/arch/sim/src/nuttx-names.dat
@@ -29,6 +29,7 @@ fwrite         NXfwrite
 fsync          NXfsync
 fstat          NXfstat
 ftell          NXftell
+ftruncate      NXftruncate
 getenv         NXgetenv
 getopt         NXgetopt
 getpid         NXgetpid