diff --git a/pyodide/meta.yaml b/pyodide/meta.yaml
index f18eceb0b2..490eee782c 100644
--- a/pyodide/meta.yaml
+++ b/pyodide/meta.yaml
@@ -5,6 +5,10 @@ package:
 source:
   path: ../../IfcOpenShell
 
+requirements:
+  build:
+    - bison
+
 build:
   script: |
     BUILD_CFG=Release python nix/build-all.py --without-rocksdb --without-hdf5 --without-opencollada --without-swig --without-pcre -v --wasm --py313 IfcOpenShell-Python