diff --git a/.github/workflows/build-wasm_of_ocaml.yml b/.github/workflows/build-wasm_of_ocaml.yml
index 840b35bb..5c41da1c 100644
--- a/.github/workflows/build-wasm_of_ocaml.yml
+++ b/.github/workflows/build-wasm_of_ocaml.yml
@@ -49,7 +49,7 @@ jobs:
         id: cache-binaryen
         uses: actions/cache/restore@v4
         with:
-          path: binaryen
+          path: binaryen/bin
           key: ${{ runner.os }}-binaryen-version_118
 
       - name: Checkout binaryen
@@ -80,7 +80,7 @@ jobs:
         if: steps.cache-binaryen.outputs.cache-hit != 'true'
         uses: actions/cache/save@v4
         with:
-          path: binaryen
+          path: binaryen/bin
           key: ${{ runner.os }}-binaryen-version_118
 
       - name: Set binaryen's path
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 18338197..1e310514 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -119,7 +119,7 @@ jobs:
         id: cache-binaryen
         uses: actions/cache/restore@v4
         with:
-          path: binaryen
+          path: binaryen/bin
           key: ${{ runner.os }}-binaryen-version_118
 
       - name: Checkout binaryen
@@ -163,13 +163,17 @@ jobs:
         if: steps.cache-binaryen.outputs.cache-hit != 'true'
         uses: actions/cache/save@v4
         with:
-          path: binaryen
+          path: binaryen/bin
           key: ${{ runner.os }}-binaryen-version_118
 
       - name: Set binaryen's path
         shell: bash
         run: echo "$GITHUB_WORKSPACE/binaryen/bin" >> $GITHUB_PATH
 
+      - name: Set binaryen's path (windows)
+        shell: bash
+        run: cp $GITHUB_WORKSPACE/binaryen/bin/wasm-{merge,opt}.exe `opam var bin`
+
       - name: Binaryen DEBUG
         shell: bash
         run: echo $PATH