diff --git a/configure.in b/configure.in
index b4a8c2135028..298c2ecaf113 100644
--- a/configure.in
+++ b/configure.in
@@ -7929,7 +7929,7 @@ if test "$NECKO_WIFI"; then
   elif test "$OS_ARCH" = "WINCE"; then
     NECKO_WIFI=1    
   else
-    AC_MSG_WARN([Necko WiFi scanning not supported on your platform.])
+    AC_MSG_ERROR([Necko WiFi scanning not supported on your platform, use --disable-necko-wifi])
   fi
   AC_SUBST(NECKO_WIFI)