diff --git a/.github/workflows/scip-index.yml b/.github/workflows/scip-index.yml
index a3124cd..d143777 100644
--- a/.github/workflows/scip-index.yml
+++ b/.github/workflows/scip-index.yml
@@ -26,6 +26,9 @@ jobs:
           curl -fsSL https://raw.githubusercontent.com/clojure-lsp/clojure-lsp/master/install | bash
           echo "$HOME/.local/bin" >> $GITHUB_PATH
 
+      - name: Compile Java protobuf classes
+        run: clojure -T:build compile-java
+
       - name: Generate SCIP index
         run: clojure -M:run -p . -o index.scip