---
 lib/url.c | 4 ++++
 1 file changed, 4 insertions(+)
diff --git a/lib/url.c b/lib/url.c
index ee888d2..cc33bc5 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -3978,6 +3978,10 @@ static CURLcode parseurlandfillconn(struct SessionHandle *data,
           /* Remove ']' */
           ifname[square_bracket] = '\0';
           scope = if_nametoindex(ifname);
+          if (scope == 0) {
+              infof(data, "Invalid network interface: %s: %s", ifname,
+                    strerror(errno));
+          }
         }
         if (scope > 0) {
           /* Remove zone identifier from hostname */
-- 
1.8.3.1
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