diff --git a/standalone/windows/build.sh b/standalone/windows/build.sh
index c842907c86..7f577c90e9 100755
--- a/standalone/windows/build.sh
+++ b/standalone/windows/build.sh
@@ -38,6 +38,8 @@ rm -f git-annex-installer.exe
 # for haskell libraries to link them with the cygwin library.
 cabal update || true
 
+cabal install warp-3.1.3.1
+
 cabal install --only-dependencies || true
 
 # Detect when the last build was an incremental build and failed,