diff --git a/src/Messages.jl b/src/Messages.jl
index 51ad50bcb..bc61d10e9 100644
--- a/src/Messages.jl
+++ b/src/Messages.jl
@@ -235,8 +235,8 @@ issafe(method) = method in ["GET", "HEAD", "OPTIONS", "TRACE"]
 Does this `Response` have an error status?
 """
 iserror(r::Response) = iserror(r.status)
-iserror(status) = status != 0 && status != 100 && status != 101 &&
-                 (status < 200 || status >= 300) && !isredirect(status)
+iserror(status::Integer) = status != 0 && status != 100 && status != 101 &&
+                          (status < 200 || status >= 300) && !isredirect(status)
 
 """
     isredirect(::Response)
@@ -245,7 +245,7 @@ Does this `Response` have a redirect status?
 """
 isredirect(r::Response) = isredirect(r.status)
 isredirect(r::Request) = allow_redirects(r) && !redirectlimitreached(r)
-isredirect(status) = status in (301, 302, 303, 307, 308)
+isredirect(status::Integer) = status in (301, 302, 303, 307, 308)
 
 # whether the redirect limit has been reached for a given request
 # set in the RedirectRequest layer once the limit is reached