diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e59e1caeee3..63ed9cf041b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -25427,6 +25427,8 @@ in
   pdfgrep  = callPackage ../tools/typesetting/pdfgrep { };
 
   pdfpc = callPackage ../applications/misc/pdfpc {
+    # https://github.com/pdfpc/pdfpc/issues/594
+    vala = vala_0_50;
     inherit (gst_all_1) gstreamer gst-plugins-base gst-plugins-good gst-libav;
   };