diff --git a/etlua.moon b/etlua.moon
index 3bc54e6..a32d42d 100644
--- a/etlua.moon
+++ b/etlua.moon
@@ -255,7 +255,7 @@ class Parser
           r\push chunk[2], "\n"
         when "=", "-"
           r\increment!
-          r\mark!
+          r\mark chunk[3]
           r\assign!
 
           if t == "=" and @html_escape