diff --git a/layout/generic/crashtests/387215-1.xhtml b/layout/generic/crashtests/387215-1.xhtml
new file mode 100644
index 00000000000..ba14e67668a
--- /dev/null
+++ b/layout/generic/crashtests/387215-1.xhtml
@@ -0,0 +1,15 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+</head>
+
+<body>
+<div style="float: left; height: 18000000px"></div>
+<p style="clear: left;"/>
+<div>
+  <div style="float: right; height: 100px;">a</div>
+  <div style="float: right; height: 18000000px;"></div>
+  <p/>
+</div>
+</body>
+
+</html>
diff --git a/layout/generic/crashtests/crashtests.list b/layout/generic/crashtests/crashtests.list
index 51faedfe2d0..73bea138ff8 100644
--- a/layout/generic/crashtests/crashtests.list
+++ b/layout/generic/crashtests/crashtests.list
@@ -62,6 +62,7 @@ load 386827-1.html
 load 387058-1.html
 load 387058-2.html
 load 387209-1.html
+load 387215-1.xhtml
 load 387219-1.xhtml
 load 388175-1.html
 load 388709-1.html
