diff --git a/lib/libc/sys/openat.c b/lib/libc/sys/openat.c
index 586effe08f9d..1bd12ea2a8d8 100644
--- a/lib/libc/sys/openat.c
+++ b/lib/libc/sys/openat.c
@@ -43,6 +43,7 @@ __sym_compat(openat, __impl_openat, FBSD_1.1);
 __weak_reference(openat, __impl_openat);
 __sym_default(openat, openat, FBSD_1.2);
 
+#pragma weak openat
 int
 openat(int fd, const char *path, int flags, ...)
 {
diff --git a/lib/libc/sys/setcontext.c b/lib/libc/sys/setcontext.c
index 005b449b3725..31b888f2bcff 100644
--- a/lib/libc/sys/setcontext.c
+++ b/lib/libc/sys/setcontext.c
@@ -42,6 +42,7 @@ __sym_compat(setcontext, __impl_setcontext, FBSD_1.0);
 __weak_reference(setcontext, __impl_setcontext);
 __sym_default(setcontext, setcontext, FBSD_1.2);
 
+#pragma weak setcontext
 int
 setcontext(const ucontext_t *uc)
 {
diff --git a/lib/libc/sys/swapcontext.c b/lib/libc/sys/swapcontext.c
index eab78c5731f6..0a8125eeabb5 100644
--- a/lib/libc/sys/swapcontext.c
+++ b/lib/libc/sys/swapcontext.c
@@ -43,6 +43,7 @@ __sym_compat(swapcontext, __impl_swapcontext, FBSD_1.0);
 __weak_reference(swapcontext, __impl_swapcontext);
 __sym_default(swapcontext, swapcontext, FBSD_1.2);
 
+#pragma weak swapcontext
 int
 swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
 {