diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index e02a371..2d9cc31 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -260,16 +260,16 @@
 #endif
 
 #if defined(__USE_BSD)
-int fflush_unlocked(FILE* __fp) __INTRODUCED_IN_FUTURE;
-int fgetc_unlocked(FILE* __fp) __INTRODUCED_IN_FUTURE;
-int fputc_unlocked(int __ch, FILE* __fp) __INTRODUCED_IN_FUTURE;
-size_t fread_unlocked(void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN_FUTURE;
-size_t fwrite_unlocked(const void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN_FUTURE;
+int fflush_unlocked(FILE* __fp) __INTRODUCED_IN(28);
+int fgetc_unlocked(FILE* __fp) __INTRODUCED_IN(28);
+int fputc_unlocked(int __ch, FILE* __fp) __INTRODUCED_IN(28);
+size_t fread_unlocked(void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN(28);
+size_t fwrite_unlocked(const void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN(28);
 #endif
 
 #if defined(__USE_GNU)
-int fputs_unlocked(const char* __s, FILE* __fp) __INTRODUCED_IN_FUTURE;
-char* fgets_unlocked(char* __buf, int __size, FILE* __fp) __INTRODUCED_IN_FUTURE;
+int fputs_unlocked(const char* __s, FILE* __fp) __INTRODUCED_IN(28);
+char* fgets_unlocked(char* __buf, int __size, FILE* __fp) __INTRODUCED_IN(28);
 #endif
 
 #if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)