diff --git a/layout/generic/nsLineLayout.cpp b/layout/generic/nsLineLayout.cpp
index ca49fafad406..ef7777373240 100644
--- a/layout/generic/nsLineLayout.cpp
+++ b/layout/generic/nsLineLayout.cpp
@@ -1880,6 +1880,9 @@ nsLineLayout::VerticalAlignFrames(PerSpanData* psd)
           psd->mBEndLeading = endLeading;
         }
         psd->mLogicalBSize += deltaLeading;
+        // We have adjusted the leadings, it is no longer a zero
+        // effective span box.
+        zeroEffectiveSpanBox = false;
       }
     }
 
diff --git a/layout/reftests/css-ruby/line-height-4-ref.html b/layout/reftests/css-ruby/line-height-4-ref.html
new file mode 100644
index 000000000000..7f6b3164874b
--- /dev/null
+++ b/layout/reftests/css-ruby/line-height-4-ref.html
@@ -0,0 +1,15 @@
+<title>Bug 1134206 - Ruby line spacing adjustment on quirks mode</title>
+<script type="text/javascript" src="utils.js"></script>
+<div id="base">
+  <span id="inline">base</span>
+  <span id="text1" style="font-size: 80%; color: transparent">text</span>
+  <span id="text2" style="font-size: 50%; color: transparent">text</span>
+</div>
+next line
+<script>
+  // Simulate the behavior of ruby layout.
+  var base = document.getElementById('base');
+  makeHeightMatchInlineBox(base, document.getElementById('inline'));
+  base.style.paddingTop = getHeight(document.getElementById('text1'));
+  base.style.paddingBottom = getHeight(document.getElementById('text2'));
+</script>
diff --git a/layout/reftests/css-ruby/line-height-4.html b/layout/reftests/css-ruby/line-height-4.html
new file mode 100644
index 000000000000..978aa5c70b0a
--- /dev/null
+++ b/layout/reftests/css-ruby/line-height-4.html
@@ -0,0 +1,7 @@
+<title>Bug 1134206 - Ruby line spacing adjustment on quirks mode</title>
+<ruby>
+  <rb>base</rb>
+  <rtc style="ruby-position: over; font-size: 80%;"><rt style="color: transparent">text</rt></rtc>
+  <rtc style="ruby-position: under; font-size: 50%;"><rt style="color: transparent">text</rt></rtc>
+</ruby><br>
+next line
diff --git a/layout/reftests/css-ruby/reftest.list b/layout/reftests/css-ruby/reftest.list
index aa77ed3b1f8e..b5d108bf87e1 100644
--- a/layout/reftests/css-ruby/reftest.list
+++ b/layout/reftests/css-ruby/reftest.list
@@ -33,6 +33,7 @@ default-preferences pref(layout.css.ruby.enabled,true)
 == line-height-1.html line-height-1-ref.html
 == line-height-2.html line-height-2-ref.html
 == line-height-3.html line-height-3-ref.html
+== line-height-4.html line-height-4-ref.html
 load nested-ruby-1.html
 == no-transform.html no-transform-ref.html
 == relative-positioning-1.html relative-positioning-1-ref.html