diff --git a/install.sh b/install.sh
index d248dffdfb5..8be41ae6c9d 100755
--- a/install.sh
+++ b/install.sh
@@ -84,7 +84,7 @@ initDownloadTool() {
 checkLatestVersion() {
   # Use the GitHub releases webpage to find the latest version for this project
   # so we don't get rate-limited.
-  CHECKLATESTVERSION_REGEX="v?[0-9][A-Za-z0-9\.-]*"
+  CHECKLATESTVERSION_REGEX="v\?[0-9][A-Za-z0-9\.-]*"
   CHECKLATESTVERSION_LATEST_URL="https://github.com/${PROJECT_OWNER}/${PROJECT_NAME}/releases/latest"
   if [ "$DOWNLOAD_TOOL" = "curl" ]; then
     CHECKLATESTVERSION_TAG=$(curl -SsL $CHECKLATESTVERSION_LATEST_URL | grep -o "<title>Release $CHECKLATESTVERSION_REGEX · ${PROJECT_OWNER}/${PROJECT_NAME}" | grep -o "$CHECKLATESTVERSION_REGEX")