diff --git a/dtool/src/dtoolutil/filename.cxx b/dtool/src/dtoolutil/filename.cxx
index 248d6b272b..55dbb40aee 100644
--- a/dtool/src/dtoolutil/filename.cxx
+++ b/dtool/src/dtoolutil/filename.cxx
@@ -1756,7 +1756,7 @@ scan_directory(vector_string &contents) const {
   return scan_ok;
 
 #elif defined(PHAVE_DIRENT_H)
-  // Use Posix's opendir() / readir() to walk through the list of
+  // Use Posix's opendir() / readdir() to walk through the list of
   // files in a directory.
   size_t orig_size = contents.size();