diff --git a/sysdeps/unix/sysv/linux/not-cancel.h b/sysdeps/unix/sysv/linux/not-cancel.h
index 62363c1b0f..ece329711b 100644
--- a/sysdeps/unix/sysv/linux/not-cancel.h
+++ b/sysdeps/unix/sysv/linux/not-cancel.h
@@ -30,16 +30,16 @@
 #include <sys/random.h>
 
 /* Non cancellable open syscall.  */
-__typeof (open) __open_nocancel;
+extern int __open_nocancel (const char *, int, ...);
 
 /* Non cancellable open syscall (LFS version).  */
-__typeof (open64) __open64_nocancel;
+extern int __open64_nocancel (const char *, int, ...);
 
 /* Non cancellable openat syscall.  */
-__typeof (openat) __openat_nocancel;
+extern int __openat_nocancel (int fd, const char *, int, ...);
 
 /* Non cacellable openat syscall (LFS version).  */
-__typeof (openat64) __openat64_nocancel;
+extern int __openat64_nocancel (int fd, const char *, int, ...);
 
 /* Non cancellable read syscall.  */
 __typeof (__read) __read_nocancel;
@@ -54,7 +54,7 @@ __typeof (__write) __write_nocancel;
 __typeof (__close) __close_nocancel;
 
 /* Uncancelable fcntl.  */
-__typeof (__fcntl) __fcntl64_nocancel;
+int __fcntl64_nocancel (int, int, ...);
 
 #if IS_IN (libc) || IS_IN (rtld)
 hidden_proto (__open_nocancel)