diff --git a/modules/auth/handlers/handlers.go b/modules/auth/handlers/handlers.go
index 09907bc..03df151 100644
--- a/modules/auth/handlers/handlers.go
+++ b/modules/auth/handlers/handlers.go
@@ -53,7 +53,7 @@ func (s Server) generateTokens(userID string) (accessToken string, refreshToken
 		"exp":     time.Now().Add(15 * time.Minute).Unix(),
 	}
 	at := jwt.NewWithClaims(jwt.SigningMethodHS256, accessClaims)
-	accessToken, err = at.SignedString(s.JwtPrivateKey)
+	accessToken, err = at.SignedString([]byte(s.JwtPrivateKey))
 	if err != nil {
 		return "", "", "", err
 	}
@@ -63,7 +63,7 @@ func (s Server) generateTokens(userID string) (accessToken string, refreshToken
 		"exp":     time.Now().Add(7 * 24 * time.Hour).Unix(),
 	}
 	rt := jwt.NewWithClaims(jwt.SigningMethodHS256, refreshClaims)
-	refreshToken, err = rt.SignedString(s.JwtPrivateKey)
+	refreshToken, err = rt.SignedString([]byte(s.JwtPrivateKey))
 	if err != nil {
 		return "", "", "", err
 	}