diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index ef97538..6888e8c 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -77,7 +77,7 @@
 unsigned long strtoul(const char* __s, char** __end_ptr, int __base);
 unsigned long long strtoull(const char* __s, char** __end_ptr, int __base);
 
-int posix_memalign(void** __memptr, size_t __alignment, size_t __size) __INTRODUCED_IN(16);
+int posix_memalign(void** __memptr, size_t __alignment, size_t __size) __INTRODUCED_IN(17);
 
 void* aligned_alloc(size_t __alignment, size_t __size) __INTRODUCED_IN(28);