diff --git a/.github/workflows/build-wasm_of_ocaml.yml b/.github/workflows/build-wasm_of_ocaml.yml
index 4b530aa1..6fccf980 100644
--- a/.github/workflows/build-wasm_of_ocaml.yml
+++ b/.github/workflows/build-wasm_of_ocaml.yml
@@ -67,7 +67,7 @@ jobs:
         run: brew install ninja
 
       - name: Install ninja (Windows)
-        if: matrix.os == 'macos-latest' && steps.cache-binaryen.outputs.cache-hit != 'true'
+        if: matrix.os == 'windows-latest' && steps.cache-binaryen.outputs.cache-hit != 'true'
         run: choco install ninja
 
       - name: Build binaryen