diff --git a/.github/actions/install/action.yml b/.github/actions/install/action.yml
index 2b8f76dc..0e285631 100644
--- a/.github/actions/install/action.yml
+++ b/.github/actions/install/action.yml
@@ -19,6 +19,10 @@ runs:
       run: |
         ln -s /usr/local/lib/libiconv vendor/libiconv
 
+    - name: build mimalloc
+      shell: bash
+      run: make install-mimalloc
+
     - name: build netsurf
       shell: bash
       run: make install-netsurf