diff --git a/functions b/functions
index 2f976cf..79b2b37 100644
--- a/functions
+++ b/functions
@@ -325,13 +325,15 @@
     fi
 }
 
+#Macro for curl statements. curl requires -g option for literal IPv6 addresses.
+CURL_GET="${CURL_GET:-curl -g}"
 
 # Wait for an HTTP server to start answering requests
 # wait_for_service timeout url
 function wait_for_service {
     local timeout=$1
     local url=$2
-    timeout $timeout sh -c "while ! curl -k --noproxy '*' -s $url >/dev/null; do sleep 1; done"
+    timeout $timeout sh -c "while ! $CURL_GET -k --noproxy '*' -s $url >/dev/null; do sleep 1; done"
 }