diff --git a/plugins/input/csv/csv_utils.hpp b/plugins/input/csv/csv_utils.hpp
index d50eb8c6d..127837505 100644
--- a/plugins/input/csv/csv_utils.hpp
+++ b/plugins/input/csv/csv_utils.hpp
@@ -32,8 +32,8 @@ namespace csv_utils
     static void fix_json_quoting(std::string & csv_line)
     {
         std::string wrapping_char;
-        std::string::size_type j_idx;
-        std::string::size_type post_idx;
+        std::string::size_type j_idx = std::string::npos;
+        std::string::size_type post_idx = std::string::npos;
         std::string::size_type j_idx_double = csv_line.find("\"{");
         std::string::size_type j_idx_single = csv_line.find("'{");
         if (j_idx_double != std::string::npos)