diff --git a/libc/include/android/dlext.h b/libc/include/android/dlext.h
index ca3bd25..c824544 100644
--- a/libc/include/android/dlext.h
+++ b/libc/include/android/dlext.h
@@ -129,7 +129,7 @@
   struct android_namespace_t* library_namespace;
 } android_dlextinfo;
 
-void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo)
+void* android_dlopen_ext(const char* __filename, int __flags, const android_dlextinfo* __info)
   __INTRODUCED_IN(21);
 
 __END_DECLS
diff --git a/libc/include/android/legacy_signal_inlines.h b/libc/include/android/legacy_signal_inlines.h
index 09db2a6..4d474b0 100644
--- a/libc/include/android/legacy_signal_inlines.h
+++ b/libc/include/android/legacy_signal_inlines.h
@@ -39,7 +39,7 @@
 
 #if __ANDROID_API__ < __ANDROID_API_L__
 
-sighandler_t bsd_signal(int signum, sighandler_t handler) __REMOVED_IN(21);
+sighandler_t bsd_signal(int __signal, sighandler_t __handler) __REMOVED_IN(21);
 
 /* These weren't introduced until L. */
 int __libc_current_sigrtmax() __attribute__((__weak__)) __VERSIONER_NO_GUARD;
diff --git a/libc/include/android/legacy_sys_stat_inlines.h b/libc/include/android/legacy_sys_stat_inlines.h
index 23a9f07..bbf54c0 100644
--- a/libc/include/android/legacy_sys_stat_inlines.h
+++ b/libc/include/android/legacy_sys_stat_inlines.h
@@ -36,8 +36,8 @@
 
 __BEGIN_DECLS
 
-static __inline int mkfifo(const char *__p, mode_t __m) {
-  return mknod(__p, (__m & ~S_IFMT) | S_IFIFO, (dev_t)0);
+static __inline int mkfifo(const char* __path, mode_t __mode) {
+  return mknod(__path, (__mode & ~S_IFMT) | S_IFIFO, (dev_t)0);
 }
 
 __END_DECLS
diff --git a/libc/include/android/set_abort_message.h b/libc/include/android/set_abort_message.h
index 18881a3..3dde673 100644
--- a/libc/include/android/set_abort_message.h
+++ b/libc/include/android/set_abort_message.h
@@ -33,7 +33,7 @@
 
 __BEGIN_DECLS
 
-void android_set_abort_message(const char* msg) __INTRODUCED_IN(21);
+void android_set_abort_message(const char* __msg) __INTRODUCED_IN(21);
 
 __END_DECLS