diff --git a/data/zsh-completion.in b/data/zsh-completion.in
index 95c49aa..6559727 100644
--- a/data/zsh-completion.in
+++ b/data/zsh-completion.in
@@ -28,10 +28,10 @@ local exts
 for PLUGIN in @PLUGINDIR@/lib*.so; do
   case ${PLUGIN##*/} in
     libpdf-poppler.so)
-      exts="$exts|pdf"
+      exts="$exts|pdf|PDF"
       ;;
     libpdf-mupdf.so)
-      exts="$exts|pdf|epub|oxps"
+      exts="$exts|pdf|PDF|epub|oxps"
       ;;
     libps.so)
       exts="$exts|ps|eps|epsi|epsf"