diff --git a/cmd/root.go b/cmd/root.go
index 6915d52..ea2cc4d 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -44,6 +44,7 @@ func RootCmd(version string) *cobra.Command {
 	cmd.PersistentFlags().BoolVarP(&imsConfig.ProxyIgnoreTLS, "proxyIgnoreTLS", "T", false,
 		"Ignore TLS certificate verification (only valid when connecting through a proxy).")
 	cmd.PersistentFlags().StringVarP(&configFile, "configFile", "f", "", "Configuration file.")
+	cmd.PersistentFlags().IntVar(&imsConfig.Timeout, "timeout", 30, "HTTP client timeout in seconds.")
 
 	cmd.AddCommand(
 		authzCmd(imsConfig),
diff --git a/ims/client.go b/ims/client.go
index cf77d03..5ab17f8 100644
--- a/ims/client.go
+++ b/ims/client.go
@@ -22,13 +22,13 @@ func (i Config) httpClient() (*http.Client, error) {
 			t.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
 		}
 		client := &http.Client{
-			Timeout:   30 * time.Second,
+			Timeout:   time.Duration(i.Timeout) * time.Second,
 			Transport: t,
 		}
 		return client, nil
 	}
 	client := &http.Client{
-		Timeout: 30 * time.Second,
+		Timeout: time.Duration(i.Timeout) * time.Second,
 	}
 	return client, nil
 }