diff --git a/libc/include/sys/syscall.h b/libc/include/sys/syscall.h
index a44b2e5..34a29df 100644
--- a/libc/include/sys/syscall.h
+++ b/libc/include/sys/syscall.h
@@ -37,7 +37,7 @@
 
 __BEGIN_DECLS
 
-int syscall(int number, ...);
+long syscall(long number, ...);
 
 __END_DECLS