diff --git a/arch/sim/src/nuttx-names.dat b/arch/sim/src/nuttx-names.dat
index 13c064b1778..759743be534 100644
--- a/arch/sim/src/nuttx-names.dat
+++ b/arch/sim/src/nuttx-names.dat
@@ -88,6 +88,7 @@ setenv         NXsetenv
 setlogmask     NXsetlogmask
 setsockopt     NXsetsockopt
 sigaction      NXsigaction
+sigaddset      NXsigaddset
 sigdelset      NXsigdelset
 sigemptyset    NXsigemptyset
 sigfillset     NXsigfillset