diff --git a/windows/network.c b/windows/network.c
index acc74034..24b14e7b 100644
--- a/windows/network.c
+++ b/windows/network.c
@@ -103,7 +103,7 @@ typedef enum SuperFamily {
 
 struct SockAddr {
     int refcount;
-    char *error;
+    const char *error;
     SuperFamily superfamily;
 #ifndef NO_IPV6
     struct addrinfo *ais;              /* Addresses IPv6 style. */