diff --git a/scripts/bootstrap/bootstrap-haskell b/scripts/bootstrap/bootstrap-haskell
index e55efaeb..971fcf83 100755
--- a/scripts/bootstrap/bootstrap-haskell
+++ b/scripts/bootstrap/bootstrap-haskell
@@ -80,13 +80,20 @@ set_msys2_env_dir() {
 }
 
 case "${plat}" in
-        MSYS*|MINGW*|CYGWIN*)
+        MSYS*|MINGW*)
 			: "${GHCUP_INSTALL_BASE_PREFIX:=/c}"
 			GHCUP_DIR=$(cygpath -u "${GHCUP_INSTALL_BASE_PREFIX}/ghcup")
 			GHCUP_BIN=$(cygpath -u "${GHCUP_INSTALL_BASE_PREFIX}/ghcup/bin")
 			: "${GHCUP_MSYS2:=${GHCUP_DIR}/msys64}"
 			set_msys2_env_dir
 			;;
+        CYGWIN*)
+			: "${GHCUP_INSTALL_BASE_PREFIX:=/cygdrive/c}"
+			GHCUP_DIR=$(cygpath -u "${GHCUP_INSTALL_BASE_PREFIX}/ghcup")
+			GHCUP_BIN=$(cygpath -u "${GHCUP_INSTALL_BASE_PREFIX}/ghcup/bin")
+			: "${GHCUP_MSYS2:=${GHCUP_DIR}/msys64}"
+			set_msys2_env_dir
+			;;
 		*)
 			: "${GHCUP_INSTALL_BASE_PREFIX:=$HOME}"