diff --git a/install-binary.sh b/install-binary.sh
index ea0e7cc0..78e79c2a 100755
--- a/install-binary.sh
+++ b/install-binary.sh
@@ -55,6 +55,7 @@ initOS() {
   OS=$(uname -s)
 
   case "$OS" in
+  Windows_NT) OS='windows' ;;
   # Msys support
   MSYS*) OS='windows' ;;
   # Minimalist GNU for Windows
@@ -123,6 +124,9 @@ downloadFile() {
 installFile() {
   tar xzf "$PLUGIN_TMP_FILE" -C "$HELM_TMP"
   HELM_TMP_BIN="$HELM_TMP/diff/bin/diff"
+  if [ "${OS}" = "windows" ]; then
+    HELM_TMP_BIN="$HELM_TMP_BIN.exe"
+  fi
   echo "Preparing to install into ${HELM_PLUGIN_DIR}"
   mkdir -p "$HELM_PLUGIN_DIR/bin"
   cp "$HELM_TMP_BIN" "$HELM_PLUGIN_DIR/bin"