diff --git a/arch/sim/src/nuttx-names.dat b/arch/sim/src/nuttx-names.dat
index 793fe124010..5d0c228149b 100644
--- a/arch/sim/src/nuttx-names.dat
+++ b/arch/sim/src/nuttx-names.dat
@@ -58,6 +58,7 @@ mktime         NXmktime
 mmap           NXmmap
 mount          NXmount
 mq_close       NXmq_close
+munmap         NXmunmap
 nanosleep      NXnanosleep
 ntohs          NXhntohs
 open           NXopen