diff --git a/dev/src/DocGenerator/Parser/CodeParser.php b/dev/src/DocGenerator/Parser/CodeParser.php
index 964e37277dc6..13d9d9b45878 100644
--- a/dev/src/DocGenerator/Parser/CodeParser.php
+++ b/dev/src/DocGenerator/Parser/CodeParser.php
@@ -828,7 +828,7 @@ private function fileNameToType($fileName)
     {
         return str_replace('src/', '', substr(
             strtolower($fileName),
-            strlen($this->projectRoot) + 1,
+            strlen($this->projectRoot),
             -4
         ));
     }
diff --git a/docs/external-classes.json b/docs/external-classes.json
index c04a3c00ad1f..9b7ab77f736f 100644
--- a/docs/external-classes.json
+++ b/docs/external-classes.json
@@ -76,9 +76,6 @@
 }, {
   "name": "Google\\LongRunning\\",
   "uri": "https://googleapis.github.io/gax-php/#Google/LongRunning/%s.html"
-}, {
-  "name": "Google\\Protobuf\\",
-  "uri": "https://googleapis.github.io/gax-php/#Google/Protobuf/%s.html"
 }, {
   "name": "Google\\Rpc\\",
   "uri": "https://googleapis.github.io/gax-php/#Google/Rpc/%s.html"