diff --git a/libc/bionic/poll.cpp b/libc/bionic/poll.cpp
index 3df8b18..41b2657 100644
--- a/libc/bionic/poll.cpp
+++ b/libc/bionic/poll.cpp
@@ -71,7 +71,7 @@
   sigset64_t mutable_ss;
   sigset64_t* mutable_ss_ptr = nullptr;
   if (ss != nullptr) {
-    mutable_ss = filter_reserved_signals(*ss);
+    mutable_ss = filter_reserved_signals(*ss, SIG_SETMASK);
     mutable_ss_ptr = &mutable_ss;
   }
 
@@ -121,7 +121,7 @@
   sigset64_t mutable_ss;
   sigset64_t* mutable_ss_ptr = nullptr;
   if (ss != nullptr) {
-    mutable_ss = filter_reserved_signals(*ss);
+    mutable_ss = filter_reserved_signals(*ss, SIG_SETMASK);
     mutable_ss_ptr = &mutable_ss;
   }