diff --git a/arch/sim/src/nuttx-names.in b/arch/sim/src/nuttx-names.in
index 59ede49ad9d..3a7bcc9d0c0 100644
--- a/arch/sim/src/nuttx-names.in
+++ b/arch/sim/src/nuttx-names.in
@@ -63,10 +63,8 @@ NXSYMBOLS(mmap)
 NXSYMBOLS(munmap)
 NXSYMBOLS(open)
 NXSYMBOLS(opendir)
-NXSYMBOLS(pclose)
 NXSYMBOLS(perror)
 NXSYMBOLS(poll)
-NXSYMBOLS(popen)
 NXSYMBOLS(posix_memalign)
 NXSYMBOLS(pthread_cond_destroy)
 NXSYMBOLS(pthread_cond_init)