diff --git a/arch/sim/src/nuttx-names.in b/arch/sim/src/nuttx-names.in
index 24c6725ab0..778639454a 100644
--- a/arch/sim/src/nuttx-names.in
+++ b/arch/sim/src/nuttx-names.in
@@ -79,6 +79,7 @@ NXSYMBOLS(malloc_usable_size)
 NXSYMBOLS(memcpy)
 NXSYMBOLS(mkdir)
 NXSYMBOLS(mmap)
+NXSYMBOLS(mprotect)
 NXSYMBOLS(munmap)
 NXSYMBOLS(open)
 NXSYMBOLS(opendir)
@@ -134,6 +135,7 @@ NXSYMBOLS(strchr)
 NXSYMBOLS(strerror)
 NXSYMBOLS(strlen)
 NXSYMBOLS(strtol)
+NXSYMBOLS(sysconf)
 NXSYMBOLS(syslog)
 NXSYMBOLS(tcgetattr)
 NXSYMBOLS(tcsetattr)