diff --git a/layout/generic/nsGfxScrollFrame.cpp b/layout/generic/nsGfxScrollFrame.cpp
index 9e05b6c0117..53c14726093 100644
--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -882,6 +882,9 @@ nsHTMLScrollFrame::Reflow(nsPresContext*           aPresContext,
     state.mComputedBorder.TopBottom();
 
   aDesiredSize.mOverflowArea = nsRect(0, 0, aDesiredSize.width, aDesiredSize.height);
+
+  CheckInvalidateSizeChange(aDesiredSize);
+
   FinishAndStoreOverflow(&aDesiredSize);
 
   if (!InInitialReflow() && !mInner.mHadNonInitialReflow) {
diff --git a/layout/reftests/bugs/438537-1-ref.html b/layout/reftests/bugs/438537-1-ref.html
new file mode 100644
index 00000000000..16b8ce4724d
--- /dev/null
+++ b/layout/reftests/bugs/438537-1-ref.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Testcase, bug 438537</title>
+  </head>
+  <body>
+    <div style="height:40px;border:solid 2px black;-moz-border-radius: 8px;overflow:hidden">
+    </div>
+  </body>
+</html>
diff --git a/layout/reftests/bugs/438537-1.html b/layout/reftests/bugs/438537-1.html
new file mode 100644
index 00000000000..169459ed540
--- /dev/null
+++ b/layout/reftests/bugs/438537-1.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>Testcase, bug 438537</title>
+    <script>
+      window.addEventListener("MozReftestInvalidate",
+        function() {
+          var div = document.getElementById("div");
+          div.style.height = "40px";
+          document.documentElement.className = "";
+        }, false);
+    </script>
+  </head>
+  <body>
+    <div id="div" style="height:20px;border:solid 2px black;-moz-border-radius: 8px;overflow:hidden">
+    </div>
+  </body>
+</html>
diff --git a/layout/reftests/bugs/526463-1-ref.html b/layout/reftests/bugs/526463-1-ref.html
new file mode 100644
index 00000000000..caecd5e7202
--- /dev/null
+++ b/layout/reftests/bugs/526463-1-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Testcase, bug 526463</title>
+  </head>
+  <body>
+    <div style="-moz-border-radius: 50px;overflow:hidden;background:gold">
+      outer div
+      <div>inner div</div>
+    </div>
+  </body>
+</html>
diff --git a/layout/reftests/bugs/526463-1.html b/layout/reftests/bugs/526463-1.html
new file mode 100644
index 00000000000..e7aec6bee5e
--- /dev/null
+++ b/layout/reftests/bugs/526463-1.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>Testcase, bug 526463</title>
+    <script>
+      window.addEventListener("MozReftestInvalidate",
+        function() {
+          var div = document.getElementById("div");
+          div.style.display = "";
+          document.documentElement.className = "";
+        }, false);
+    </script>
+  </head>
+  <body>
+    <div style="-moz-border-radius: 50px;overflow:hidden;background:gold">
+      outer div
+      <div id="div" style="display:none">inner div</div>
+    </div>
+  </body>
+</html>
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index 3695650125d..e1f0748dc80 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1059,6 +1059,7 @@ fails == 428810-3e-rtl-insets.html 428810-empty-rtl-insets-ref.html # bug 179596
 == 431341-2.html 431341-2-ref.html
 == 431520-1.html 431520-1-ref.html
 == 431948-1.html 431948-1-ref.html
+== 438537-1.html 438537-1-ref.html
 == 440112.html 440112-ref.html
 == 433640-1.html 433640-1-ref.html
 == 433700.html 433700-ref.html
@@ -1340,6 +1341,7 @@ fails-if(MOZ_WIDGET_TOOLKIT!="cocoa") == 488692-1.html 488692-1-ref.html # needs
 == 523096-1.html 523096-1-ref.html
 == 523468-1.html 523468-1-ref.html
 == 524175-1.html 524175-1-ref.html
+== 526463-1.html 526463-1-ref.html
 == 527464-1.html 527464-ref.html
 == 528038-1a.html 528038-1-ref.html
 == 528038-1b.html 528038-1-ref.html
