diff --git a/scripts/deliver.sh b/scripts/deliver.sh
index 58aaa8d8..844a20de 100755
--- a/scripts/deliver.sh
+++ b/scripts/deliver.sh
@@ -47,6 +47,18 @@ fi
 echo ${DEST_DIR}
 
 pushd "${DIST_DIR}"
+if [ ! -f "./${PROJECT_OUT_FILE}" ]; then
+  error_exit "failed to find file: ${PROJECT_OUT_FILE}" 1
+fi
+
+if [ ! -f "./${PROJECT_OUT_FILE}.sha256" ]; then
+  error_exit "failed to find file: ${PROJECT_OUT_FILE}.sha256" 1
+fi
+
+if [ "${PROJECT_PRIVATE_KEY}" != "" ] && [ ! -f "./${PROJECT_OUT_FILE}.sig" ]; then
+  error_exit "failed to find file: ${PROJECT_OUT_FILE}.sig" 1
+fi
+
 cp -f ./${PROJECT_OUT_FILE} ${DEST_DIR} || error_exit "failed to deliver file: ${PROJECT_OUT_FILE}" 1
 cp -f ./${PROJECT_OUT_FILE}.sha256 ${DEST_DIR} || error_exit "failed to deliver file: ${PROJECT_OUT_FILE}.sha256" 1
 if [ "${PROJECT_PRIVATE_KEY}" != "" ]; then