diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index fa2538be..1dd5b8c8 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -646,6 +646,7 @@ Gnuplot:
   primary_extension: .gp
   extensions:
   - .gnu
+  - .gnuplot
   - .plot
   - .plt