diff --git a/docs/compile_options.md b/docs/compile_options.md
index 178f05a3..4b4f9f9e 100644
--- a/docs/compile_options.md
+++ b/docs/compile_options.md
@@ -19,3 +19,37 @@ For Bundler, use its configuration system:
 ```
 bundle config build.puma "--with-cflags='-D PUMA_QUERY_STRING_MAX_LENGTH=64000'"
 ```
+
+## Request Path, `PUMA_REQUEST_PATH_MAX_LENGTH`
+
+By default, the max length of `REQUEST_PATH` is `8192`. But you may want to
+adjust it to accept longer paths in requests.
+
+For manual install, pass the `PUMA_REQUEST_PATH_MAX_LENGTH` option like this:
+
+```
+gem install puma -- --with-cflags="-D PUMA_REQUEST_PATH_MAX_LENGTH=64000"
+```
+
+For Bundler, use its configuration system:
+
+```
+bundle config build.puma "--with-cflags='-D PUMA_REQUEST_PATH_MAX_LENGTH=64000'"
+```
+
+## Request URI, `PUMA_REQUEST_URI_MAX_LENGTH`
+
+By default, the max length of `REQUEST_URI` is `1024 * 12`. But you may want to
+adjust it to accept longer URIs in requests.
+
+For manual install, pass the `PUMA_REQUEST_URI_MAX_LENGTH` option like this:
+
+```
+gem install puma -- --with-cflags="-D PUMA_REQUEST_URI_MAX_LENGTH=64000"
+```
+
+For Bundler, use its configuration system:
+
+```
+bundle config build.puma "--with-cflags='-D PUMA_REQUEST_URI_MAX_LENGTH=64000'"
+```
diff --git a/ext/puma_http11/puma_http11.c b/ext/puma_http11/puma_http11.c
index 35c70812..367137c8 100644
--- a/ext/puma_http11/puma_http11.c
+++ b/ext/puma_http11/puma_http11.c
@@ -52,15 +52,23 @@ static VALUE global_request_path;
 
 
 /* Defines the maximum allowed lengths for various input elements.*/
+#ifndef PUMA_REQUEST_URI_MAX_LENGTH
+#define PUMA_REQUEST_URI_MAX_LENGTH (1024 * 12)
+#endif
+
+#ifndef PUMA_REQUEST_PATH_MAX_LENGTH
+#define PUMA_REQUEST_PATH_MAX_LENGTH (8192)
+#endif
+
 #ifndef PUMA_QUERY_STRING_MAX_LENGTH
 #define PUMA_QUERY_STRING_MAX_LENGTH (1024 * 10)
 #endif
 
 DEF_MAX_LENGTH(FIELD_NAME, 256);
 DEF_MAX_LENGTH(FIELD_VALUE, 80 * 1024);
-DEF_MAX_LENGTH(REQUEST_URI, 1024 * 12);
+DEF_MAX_LENGTH(REQUEST_URI, PUMA_REQUEST_URI_MAX_LENGTH);
 DEF_MAX_LENGTH(FRAGMENT, 1024); /* Don't know if this length is specified somewhere or not */
-DEF_MAX_LENGTH(REQUEST_PATH, 8192);
+DEF_MAX_LENGTH(REQUEST_PATH, PUMA_REQUEST_PATH_MAX_LENGTH);
 DEF_MAX_LENGTH(QUERY_STRING, PUMA_QUERY_STRING_MAX_LENGTH);
 DEF_MAX_LENGTH(HEADER, (1024 * (80 + 32)));