diff --git a/libc/bionic/spawn.cpp b/libc/bionic/spawn.cpp
index 5d76f77..38f99ad 100644
--- a/libc/bionic/spawn.cpp
+++ b/libc/bionic/spawn.cpp
@@ -41,7 +41,6 @@
 #include <android/fdsan.h>
 
 #include "private/ScopedSignalBlocker.h"
-#include "private/SigSetConverter.h"
 
 static int set_cloexec(int i) {
   int v = fcntl(i, F_GETFD);
@@ -131,8 +130,10 @@
   pid_t pgroup;
   sched_param schedparam;
   int schedpolicy;
-  SigSetConverter sigmask;
-  SigSetConverter sigdefault;
+  union {
+    sigset_t sigset;
+    sigset64_t sigset64;
+  } sigmask, sigdefault;
 };
 
 static void ApplyAttrs(short flags, const posix_spawnattr_t* attr) {