diff --git a/libc/include/stdio_ext.h b/libc/include/stdio_ext.h
index 3c5abc3..66a3ab9 100644
--- a/libc/include/stdio_ext.h
+++ b/libc/include/stdio_ext.h
@@ -32,22 +32,23 @@
 #include <sys/cdefs.h>
 #include <stdio.h>
 
-#define FSETLOCKING_QUERY 0
-#define FSETLOCKING_INTERNAL 1
-#define FSETLOCKING_BYCALLER 2
 
 __BEGIN_DECLS
 
-size_t __fbufsize(FILE*) __INTRODUCED_IN(23);
-int __freadable(FILE*) __INTRODUCED_IN(23);
-int __freading(FILE*) __INTRODUCED_IN_FUTURE;
-int __fwritable(FILE*) __INTRODUCED_IN(23);
-int __fwriting(FILE*) __INTRODUCED_IN_FUTURE;
-int __flbf(FILE*) __INTRODUCED_IN(23);
-void __fpurge(FILE*) __INTRODUCED_IN(23);
-size_t __fpending(FILE*) __INTRODUCED_IN(23);
+size_t __fbufsize(FILE* __fp) __INTRODUCED_IN(23);
+int __freadable(FILE* __fp) __INTRODUCED_IN(23);
+int __freading(FILE* __fp) __INTRODUCED_IN_FUTURE;
+int __fwritable(FILE* __fp) __INTRODUCED_IN(23);
+int __fwriting(FILE* __fp) __INTRODUCED_IN_FUTURE;
+int __flbf(FILE* __fp) __INTRODUCED_IN(23);
+void __fpurge(FILE* __fp) __INTRODUCED_IN(23);
+size_t __fpending(FILE* __fp) __INTRODUCED_IN(23);
 void _flushlbf(void) __INTRODUCED_IN(23);
-int __fsetlocking(FILE*, int) __INTRODUCED_IN(23);
+
+#define FSETLOCKING_QUERY 0
+#define FSETLOCKING_INTERNAL 1
+#define FSETLOCKING_BYCALLER 2
+int __fsetlocking(FILE* __fp, int __type) __INTRODUCED_IN(23);
 
 __END_DECLS