diff --git a/caddytls/setup.go b/caddytls/setup.go
index a1620d579..67072e0f9 100644
--- a/caddytls/setup.go
+++ b/caddytls/setup.go
@@ -312,7 +312,7 @@ func setupTLS(c *caddy.Controller) error {
 
 					resp, err := onDemandAskClient.Get(askURLParsed.String())
 					if err != nil {
-						return fmt.Errorf("error checking %v to deterine if certificate for hostname '%s' should be allowed: %v",
+						return fmt.Errorf("error checking %v to determine if certificate for hostname '%s' should be allowed: %v",
 							askURL, name, err)
 					}
 					resp.Body.Close()