diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cae18da..f31c68b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       GEANT4_VERSION: "${{ github.event.inputs.version }}"
-      GEANT4_ARCHIVE: "geant4.${{ github.event.inputs.version }}-binaries.tar.gz"
+      GEANT4_ARCHIVE: "${{ github.event.inputs.version }}-binaries.tar.gz"
     steps:
      - name: Check out repository code
        uses: actions/checkout@v2
diff --git a/build.sh b/build.sh
index c079760..6a00e33 100755
--- a/build.sh
+++ b/build.sh
@@ -8,7 +8,7 @@ if [ -z "$GEANT4_VERSION" ]; then
 fi
 
 # Download the source code.
-dir="geant4.$GEANT4_VERSION"
+dir="$GEANT4_VERSION"
 archive="$dir.tar.gz"
 url="https://geant4-data.web.cern.ch/releases/$archive"
 wget "$url"