diff --git a/go.mod b/go.mod
index 0edd37c..9b3e37d 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	github.com/gin-contrib/zap v0.0.0-20190405225521-7c4b822813e7
 	github.com/gin-gonic/gin v1.3.0
 	github.com/go-redis/redis v6.15.2+incompatible
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/pflag v1.0.3 // indirect
 	go.uber.org/zap v1.9.1
diff --git a/go.sum b/go.sum
index 609f9ba..26da0fc 100644
--- a/go.sum
+++ b/go.sum
@@ -9,6 +9,8 @@ github.com/go-redis/redis v6.15.2+incompatible h1:9SpNVG76gr6InJGxoZ6IuuxaCOQwDA
 github.com/go-redis/redis v6.15.2+incompatible/go.mod h1:NAIEuMOZ/fxfXJIrKDQDz8wamY7mA7PouImQ2Jvg6kA=
 github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
+github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/json-iterator/go v1.1.5/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
diff --git a/proxy/server.go b/proxy/server.go
index 24525e9..f007423 100644
--- a/proxy/server.go
+++ b/proxy/server.go
@@ -2,6 +2,7 @@ package proxy
 
 import (
 	"net/http"
+	"strconv"
 	"strings"
 	"time"
 
@@ -54,7 +55,7 @@ func (proxy Proxy) getPackageHandler(options ServerOptions) gin.HandlerFunc {
 			if err != nil {
 				c.AbortWithError(500, err)
 			} else {
-				c.Header("Cache-Control", "public, max-age="+string(int(options.DatabaseExpiration.Seconds())))
+				c.Header("Cache-Control", "public, max-age="+strconv.Itoa(int(options.DatabaseExpiration.Seconds())))
 				c.Data(200, "application/json", pkg)
 			}
 		}