diff --git a/mozilla/layout/reftests/bugs/386147-1-ref.html b/mozilla/layout/reftests/bugs/386147-1-ref.html
new file mode 100644
index 00000000000..959c4e178ef
--- /dev/null
+++ b/mozilla/layout/reftests/bugs/386147-1-ref.html
@@ -0,0 +1,6 @@
+<div style="-moz-column-count: 2; width: 10em">
+<div>
+a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>
+</div>
+<div>
+bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
diff --git a/mozilla/layout/reftests/bugs/386147-1.html b/mozilla/layout/reftests/bugs/386147-1.html
new file mode 100644
index 00000000000..59de62a74bb
--- /dev/null
+++ b/mozilla/layout/reftests/bugs/386147-1.html
@@ -0,0 +1,6 @@
+<div style="-moz-column-count: 2; width: 10em">
+<div style="float:left;">
+a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>a<br>
+</div>
+<div style="float:left">
+bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
diff --git a/mozilla/layout/reftests/bugs/reftest.list b/mozilla/layout/reftests/bugs/reftest.list
index 8294046dac2..a55ad1ee75e 100644
--- a/mozilla/layout/reftests/bugs/reftest.list
+++ b/mozilla/layout/reftests/bugs/reftest.list
@@ -290,6 +290,7 @@ random-if(MOZ_WIDGET_TOOLKIT=="cocoa") == 379316-2.html 379316-2-ref.html # bug
 == 384576-1.html 384576-1-ref.html
 == 384762-1.html about:blank
 == 384876-1.html 384876-1-ref.html
+== 386147-1.html 386147-1-ref.html
 == 386470-1a.html 386470-1-ref.html
 == 386470-1b.html 386470-1-ref.html
 == 386470-1c.html 386470-1-ref.html