diff --git a/resources/lib/std/libc.c3 b/resources/lib/std/libc.c3
index ae521f226..417e280f1 100644
--- a/resources/lib/std/libc.c3
+++ b/resources/lib/std/libc.c3
@@ -160,7 +160,7 @@ enum Errno : ErrnoType
     ENOTRECOVERABLE = 131, /* State not recoverable */
 }
 
-extern fn Errno errno(void);
+extern fn Errno errno();
 
 define TerminateFunction = fn void();
 define CompareFunction = fn int(void*, void*);