diff --git a/libc/bionic/sigaction.cpp b/libc/bionic/sigaction.cpp
index 53b2a02..19a08e6 100644
--- a/libc/bionic/sigaction.cpp
+++ b/libc/bionic/sigaction.cpp
@@ -90,7 +90,9 @@
     kernel_new = {};
     kernel_new.sa_flags = bionic_new->sa_flags;
     kernel_new.sa_handler = bionic_new->sa_handler;
+#if defined(SA_RESTORER)
     kernel_new.sa_restorer = bionic_new->sa_restorer;
+#endif
     memcpy(&kernel_new.sa_mask, &bionic_new->sa_mask, sizeof(bionic_new->sa_mask));
   }
 
@@ -100,7 +102,9 @@
     *bionic_old = {};
     bionic_old->sa_flags = kernel_old.sa_flags;
     bionic_old->sa_handler = kernel_old.sa_handler;
+#if defined(SA_RESTORER)
     bionic_old->sa_restorer = kernel_old.sa_restorer;
+#endif
     memcpy(&bionic_old->sa_mask, &kernel_old.sa_mask, sizeof(bionic_old->sa_mask));
   }
   return result;
@@ -110,10 +114,12 @@
   struct sigaction64 kernel_new;
   if (bionic_new) {
     kernel_new = *bionic_new;
+#if defined(SA_RESTORER)
     if (!(kernel_new.sa_flags & SA_RESTORER)) {
       kernel_new.sa_flags |= SA_RESTORER;
       kernel_new.sa_restorer = (kernel_new.sa_flags & SA_SIGINFO) ? &__restore_rt : &__restore;
     }
+#endif
   }
 
   return __rt_sigaction(signal,