diff --git a/ndk/platforms/android-20/include/locale.h b/ndk/platforms/android-20/include/locale.h
index b6dbfdbb5..4efc5643b 100644
--- a/ndk/platforms/android-20/include/locale.h
+++ b/ndk/platforms/android-20/include/locale.h
@@ -51,12 +51,41 @@ enum {
 
 extern char* setlocale(int, const char*);
 
-#if !defined(__LP64__)
-// TODO: LP32 had these bogus declarations but LP64 should have a real struct lconv and localeconv(3).
+#if defined(__LP64__)
+struct lconv {
+    char* decimal_point;
+    char* thousands_sep;
+    char* grouping;
+    char* int_curr_symbol;
+    char* currency_symbol;
+    char* mon_decimal_point;
+    char* mon_thousands_sep;
+    char* mon_grouping;
+    char* positive_sign;
+    char* negative_sign;
+    char  int_frac_digits;
+    char  frac_digits;
+    char  p_cs_precedes;
+    char  p_sep_by_space;
+    char  n_cs_precedes;
+    char  n_sep_by_space;
+    char  p_sign_posn;
+    char  n_sign_posn;
+    /* ISO-C99 */
+    char  int_p_cs_precedes;
+    char  int_p_sep_by_space;
+    char  int_n_cs_precedes;
+    char  int_n_sep_by_space;
+    char  int_p_sign_posn;
+    char  int_n_sign_posn;
+};
+#else
+// Keep old declaration for ILP32 for compatibility
 struct lconv { };
-struct lconv* localeconv(void);
 #endif
 
+struct lconv* localeconv(void);
+
 __END_DECLS
 
 #endif /* _LOCALE_H_ */