diff --git a/libc/include/string.h b/libc/include/string.h
index 74dfbda..d6b2967 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -136,12 +136,8 @@
 int strcoll(const char* _Nonnull __lhs, const char* _Nonnull __rhs) __attribute_pure__;
 size_t strxfrm(char* __BIONIC_COMPLICATED_NULLNESS __dst, const char* _Nonnull __src, size_t __n);
 
-#if __ANDROID_API__ >= 21
 int strcoll_l(const char* _Nonnull __lhs, const char* _Nonnull __rhs, locale_t _Nonnull __l) __attribute_pure__ __INTRODUCED_IN(21);
 size_t strxfrm_l(char* __BIONIC_COMPLICATED_NULLNESS __dst, const char* _Nonnull __src, size_t __n, locale_t _Nonnull __l) __INTRODUCED_IN(21);
-#else
-// Implemented as static inlines before 21.
-#endif
 
 #if defined(__USE_GNU) && !defined(basename)
 /*
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index f0966de..add3606 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -121,7 +121,6 @@
 int wprintf(const wchar_t* __fmt, ...);
 int wscanf(const wchar_t* __fmt, ...);
 
-#if __ANDROID_API__ >= 21
 long long wcstoll_l(const wchar_t* __s, wchar_t** __end_ptr, int __base, locale_t __l) __INTRODUCED_IN(21);
 unsigned long long wcstoull_l(const wchar_t* __s, wchar_t** __end_ptr, int __base, locale_t __l) __INTRODUCED_IN(21);
 long double wcstold_l(const wchar_t* __s, wchar_t** __end_ptr, locale_t __l) __INTRODUCED_IN(21);
@@ -129,9 +128,6 @@
 int wcscoll_l(const wchar_t* __lhs, const wchar_t* __rhs, locale_t __l) __attribute_pure__
     __INTRODUCED_IN(21);
 size_t wcsxfrm_l(wchar_t* __dst, const wchar_t* __src, size_t __n, locale_t __l) __INTRODUCED_IN(21);
-#else
-// Implemented as static inlines before 21.
-#endif
 
 size_t wcslcat(wchar_t* __dst, const wchar_t* __src, size_t __n);
 size_t wcslcpy(wchar_t* __dst, const wchar_t* __src, size_t __n);
diff --git a/libc/include/wctype.h b/libc/include/wctype.h
index 7da2bb4..344343f 100644
--- a/libc/include/wctype.h
+++ b/libc/include/wctype.h
@@ -35,7 +35,6 @@
 
 __BEGIN_DECLS
 
-#if __ANDROID_API__ >= 21
 int iswalnum_l(wint_t __wc, locale_t _Nonnull __l) __INTRODUCED_IN(21);
 int iswalpha_l(wint_t __wc, locale_t _Nonnull __l) __INTRODUCED_IN(21);
 int iswblank_l(wint_t __wc, locale_t _Nonnull __l) __INTRODUCED_IN(21);
@@ -51,9 +50,6 @@
 
 wint_t towlower_l(wint_t __wc, locale_t _Nonnull __l) __INTRODUCED_IN(21);
 wint_t towupper_l(wint_t __wc, locale_t _Nonnull __l) __INTRODUCED_IN(21);
-#else
-// Implemented as static inlines before 21.
-#endif
 
 wint_t towctrans_l(wint_t __wc, wctrans_t _Nonnull __transform, locale_t _Nonnull __l) __INTRODUCED_IN(26);
 wctrans_t _Nonnull wctrans_l(const char* _Nonnull __name, locale_t _Nonnull __l) __INTRODUCED_IN(26);