diff --git a/libc/private/bionic_futex.h b/libc/private/bionic_futex.h
index eb49fb7..6c7fdbe 100644
--- a/libc/private/bionic_futex.h
+++ b/libc/private/bionic_futex.h
@@ -30,6 +30,8 @@
 
 #include <linux/futex.h>
 
+__BEGIN_DECLS
+
 extern int __futex_wait(volatile void *ftx, int val, const struct timespec *timeout);
 extern int __futex_wake(volatile void *ftx, int count);
 
@@ -54,4 +56,6 @@
 extern int  __futex_wake_ex(volatile void *ftx, int pshared, int val);
 extern int  __futex_wait_ex(volatile void *ftx, int pshared, int val, const struct timespec *timeout);
 
+__END_DECLS
+
 #endif /* _BIONIC_FUTEX_H */