diff --git a/libc/include/dlfcn.h b/libc/include/dlfcn.h
index c2e8980..25a302f 100644
--- a/libc/include/dlfcn.h
+++ b/libc/include/dlfcn.h
@@ -47,7 +47,8 @@
 extern int dlclose(void*  handle);
 extern const char* dlerror(void);
 extern void* dlsym(void* handle, const char* symbol) __nonnull((2));
-extern void* dlvsym(void* handle, const char* symbol, const char* version) __nonnull((2, 3));
+extern void* dlvsym(void* handle, const char* symbol, const char* version) __nonnull((2, 3))
+  __INTRODUCED_IN(24);
 extern int dladdr(const void* addr, Dl_info *info);
 
 enum {