diff --git a/arch/sim/src/nuttx-names.in b/arch/sim/src/nuttx-names.in
index ec12f28a6e6..3117054727f 100644
--- a/arch/sim/src/nuttx-names.in
+++ b/arch/sim/src/nuttx-names.in
@@ -38,6 +38,7 @@ NXSYMBOLS(closedir)
 NXSYMBOLS(connect)
 NXSYMBOLS(dup)
 NXSYMBOLS(exit)
+NXSYMBOLS(free)
 NXSYMBOLS(fstat)
 NXSYMBOLS(fsync)
 NXSYMBOLS(ftruncate)
@@ -50,6 +51,7 @@ NXSYMBOLS(mmap)
 NXSYMBOLS(munmap)
 NXSYMBOLS(open)
 NXSYMBOLS(opendir)
+NXSYMBOLS(perror)
 NXSYMBOLS(poll)
 NXSYMBOLS(pthread_create)
 NXSYMBOLS(pthread_cond_destroy)
@@ -81,6 +83,8 @@ NXSYMBOLS(sleep)
 NXSYMBOLS(socket)
 NXSYMBOLS(stat)
 NXSYMBOLS(statvfs)
+NXSYMBOLS(strerror)
+NXSYMBOLS(syslog)
 NXSYMBOLS(tcgetattr)
 NXSYMBOLS(tcsetattr)
 NXSYMBOLS(unlink)