diff --git a/init.el b/init.el
index 9f32ac2..1491e53 100644
--- a/init.el
+++ b/init.el
@@ -832,6 +832,7 @@ With argument, do this that many times."
   ("\\`/etc/conf\\.d/" . conf-mode)     ; Use conf-mode for openrc config files.
   ("\\`/etc/portage/package\\.use/" . conf-mode)
   ("\\`/etc/portage/package\\.accept_keywords/" . conf-mode)
+  ("\\.pc\\(\\.in\\)?$" . conf-mode)    ; pkg-config files.
   )
 
 (use-package adoc-mode