diff --git a/src/auth/jwt.cpp b/src/auth/jwt.cpp
index 5a7f032..a785c3b 100644
--- a/src/auth/jwt.cpp
+++ b/src/auth/jwt.cpp
@@ -28,19 +28,19 @@ http::auth::jwt::Jwt http::auth::jwt::Jwt::fromCookies(const std::string &cookie
     Jwt t;
     if (pc.find("auth") != pc.end()) {
         const auto auth = pc.at("auth");
-        int firstDot = -1;
-        int secondDot = -1;
+        std::string::size_type firstDot = std::string::npos;
+        std::string::size_type secondDot = std::string::npos;
         for (size_t i = 0; i < auth.size(); i++) {
             if (auth[i] == '.') {
-                if (firstDot < 0) { firstDot = static_cast<int>(i); }
-                else if (secondDot < 0) { secondDot = static_cast<int>(i); }
+                if (firstDot == std::string::npos) { firstDot = static_cast<int>(i); }
+                else if (secondDot == std::string::npos) { secondDot = static_cast<int>(i); }
                 else {
                     // так быть не должно
                     return t;
                 }
             }
         }
-        if (firstDot < 0 || secondDot < 0 || secondDot - firstDot == 0) {
+        if (firstDot == std::string::npos || secondDot == std::string::npos || secondDot - firstDot == 0) {
             // так тоже быть не должно
             return t;
         }