diff --git a/doc/api/deprecations.md b/doc/api/deprecations.md
index 8333597513a756..82226d4fbe4772 100644
--- a/doc/api/deprecations.md
+++ b/doc/api/deprecations.md
@@ -2469,12 +2469,15 @@ Module.createRequireFromPath() is deprecated. Please use [`module.createRequire(
 ### DEP0131: Legacy HTTP parser
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/TBD
+    description: Runtime deprecation.
   - version: v12.3.0
     pr-url: https://github.com/nodejs/node/pull/27498
     description: Documentation-only.
 -->
 
-Type: Documentation-only
+Type: Runtime
 
 The legacy HTTP parser, used by default in versions of Node.js prior to 12.0.0,
 is deprecated. This deprecation applies to users of the
diff --git a/src/node_http_parser_impl.h b/src/node_http_parser_impl.h
index 7c39bc15c72a38..77d09a939cb72b 100644
--- a/src/node_http_parser_impl.h
+++ b/src/node_http_parser_impl.h
@@ -26,6 +26,9 @@
 
 #include "node.h"
 #include "node_buffer.h"
+#ifndef NODE_EXPERIMENTAL_HTTP
+#include "node_process.h"
+#endif  /* NODE_EXPERIMENTAL_HTTP */
 #include "util.h"
 
 #include "async_wrap-inl.h"
@@ -1021,6 +1024,10 @@ void InitializeHttpParser(Local<Object> target,
 #ifndef NODE_EXPERIMENTAL_HTTP
   static uv_once_t init_once = UV_ONCE_INIT;
   uv_once(&init_once, InitMaxHttpHeaderSizeOnce);
+  ProcessEmitDeprecationWarning(
+    env,
+    "The legacy HTTP parser is deprecated.",
+    "DEP0131").IsNothing();
 #endif  /* NODE_EXPERIMENTAL_HTTP */
 }
 
diff --git a/test/parallel/test-http-parser-legacy-deprecation.js b/test/parallel/test-http-parser-legacy-deprecation.js
new file mode 100644
index 00000000000000..6c4c690a9b9169
--- /dev/null
+++ b/test/parallel/test-http-parser-legacy-deprecation.js
@@ -0,0 +1,11 @@
+'use strict';
+const common = require('../common');
+
+// Flags: --http-parser=legacy
+require('http');
+
+common.expectWarning({
+  DeprecationWarning:
+    ['The legacy HTTP parser is deprecated.',
+     'DEP0131']
+});