diff --git a/lib/curl_path.h b/lib/curl_path.h
index 5ee4ff367..636c37f20 100644
--- a/lib/curl_path.h
+++ b/lib/curl_path.h
@@ -44,4 +44,4 @@ CURLcode Curl_getworkingpath(struct connectdata *conn,
                              char **path);
 
 CURLcode Curl_get_pathname(const char **cpp, char **path, char *homedir);
-#endif
+#endif /* HEADER_CURL_PATH_H */
diff --git a/lib/doh.h b/lib/doh.h
index 5f879e50e..83c79bc5d 100644
--- a/lib/doh.h
+++ b/lib/doh.h
@@ -102,4 +102,4 @@ DOHcode doh_decode(unsigned char *doh,
                    struct dohentry *d);
 void de_cleanup(struct dohentry *d);
 #endif
-#endif
+#endif /* HEADER_CURL_DOH_H */
diff --git a/lib/dotdot.h b/lib/dotdot.h
index fac8e6f2a..125af4367 100644
--- a/lib/dotdot.h
+++ b/lib/dotdot.h
@@ -22,4 +22,4 @@
  *
  ***************************************************************************/
 char *Curl_dedotdotify(const char *input);
-#endif
+#endif /* HEADER_CURL_DOTDOT_H */
diff --git a/lib/urlapi-int.h b/lib/urlapi-int.h
index a5bb8ea0b..a57d2e22b 100644
--- a/lib/urlapi-int.h
+++ b/lib/urlapi-int.h
@@ -30,4 +30,4 @@ bool Curl_is_absolute_url(const char *url, char *scheme, size_t buflen);
 char *Curl_concat_url(const char *base, const char *relurl);
 size_t Curl_strlen_url(const char *url, bool relative);
 void Curl_strcpy_url(char *output, const char *url, bool relative);
-#endif
+#endif /* HEADER_CURL_URLAPI_INT_H */