diff --git a/contrib/build-wine/prepare-wine.sh b/contrib/build-wine/prepare-wine.sh
index 059525874..7d31ddbd9 100755
--- a/contrib/build-wine/prepare-wine.sh
+++ b/contrib/build-wine/prepare-wine.sh
@@ -119,7 +119,7 @@ info "Building PyInstaller."
     git init
     git remote add origin $PYINSTALLER_REPO
     git fetch --depth 1 origin $PYINSTALLER_COMMIT
-    git checkout -b pinned "${$PYINSTALLER_COMMIT}^{commit}"
+    git checkout -b pinned "${PYINSTALLER_COMMIT}^{commit}"
     rm -fv PyInstaller/bootloader/Windows-*/run*.exe || true
     # add reproducible randomness. this ensures we build a different bootloader for each commit.
     # if we built the same one for all releases, that might also get anti-virus false positives