diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index f0ff8e5..9a1f4dc 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -15,11 +15,11 @@ jobs:
         PREFIX=$(pwd)/installed
         git clone ${{ vars.VERSIONERS_URI }} deps/versioners
         cd deps/versioners
-        PREFIX=$PREFIX make install
+        PREFIX="$PREFIX" make install
         cd ../../
         git clone ${{ vars.SHUNIT_URI }} deps/shunit
         cd deps/shunit
-        PREFIX=$PREFIX make install
+        PREFIX="$PREFIX" make install
         cd ../../
         make test-ci
         cat junit.xml