diff --git a/layout/reftests/table-anonymous-boxes/3-blocks-ref.html b/layout/reftests/table-anonymous-boxes/3-blocks-ref.html
index 4fac4d3a298..9c0458d9784 100644
--- a/layout/reftests/table-anonymous-boxes/3-blocks-ref.html
+++ b/layout/reftests/table-anonymous-boxes/3-blocks-ref.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <html>
-  <body style="font-family: monospace">
+  <body style="font-family: monospace; white-space: nowrap">
     <div>
       Row 1, Col 1Row 1, Col 2Row 1, Col 3
     </div>
diff --git a/layout/reftests/table-anonymous-boxes/3-tables-ref.html b/layout/reftests/table-anonymous-boxes/3-tables-ref.html
index 81d7124c1d6..083dbd361db 100644
--- a/layout/reftests/table-anonymous-boxes/3-tables-ref.html
+++ b/layout/reftests/table-anonymous-boxes/3-tables-ref.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <html>
-  <body style="font-family: monospace">
+  <body style="font-family: monospace; white-space: nowrap">
     <table cellpadding="0" cellspacing="0" style="margin: 0; padding: 0; border: none">
       <tr>
         <td>Row 1, Col 1</td>
diff --git a/layout/reftests/table-anonymous-boxes/blocks-divide-tables-1.html b/layout/reftests/table-anonymous-boxes/blocks-divide-tables-1.html
index 883df5e23ad..a2628f71596 100644
--- a/layout/reftests/table-anonymous-boxes/blocks-divide-tables-1.html
+++ b/layout/reftests/table-anonymous-boxes/blocks-divide-tables-1.html
@@ -5,7 +5,7 @@
     <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
     <link rel="help" href="http://www.w3.org/TR/CSS21/tables.html#anonymous-boxes"/>
     <meta name="flags" content="" />
-  <body style="font-family: monospace">
+  <body style="font-family: monospace; white-space: nowrap">
     <span style="display: block"> 
       <span style="display: table-cell">Row 1, Col 1</span>
       <span style="display: table-cell">Row 1, Col 2</span>
diff --git a/layout/reftests/table-anonymous-boxes/blocks-divide-tables-2.html b/layout/reftests/table-anonymous-boxes/blocks-divide-tables-2.html
index db5d4741c99..987acae2073 100644
--- a/layout/reftests/table-anonymous-boxes/blocks-divide-tables-2.html
+++ b/layout/reftests/table-anonymous-boxes/blocks-divide-tables-2.html
@@ -5,7 +5,7 @@
     <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
     <link rel="help" href="http://www.w3.org/TR/CSS21/tables.html#anonymous-boxes"/>
     <meta name="flags" content="" />
-  <body style="font-family: monospace">
+  <body style="font-family: monospace; white-space: nowrap">
     <span style="display: table-row"> 
       <span style="display: table-cell">Row 1, Col 1</span>
       <span style="display: table-cell">Row 1, Col 2</span>
diff --git a/layout/reftests/table-anonymous-boxes/infer-cells-1.html b/layout/reftests/table-anonymous-boxes/infer-cells-1.html
index c81de7a1005..4d5b078add4 100644
--- a/layout/reftests/table-anonymous-boxes/infer-cells-1.html
+++ b/layout/reftests/table-anonymous-boxes/infer-cells-1.html
@@ -5,7 +5,7 @@
     <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
     <link rel="help" href="http://www.w3.org/TR/CSS21/tables.html#anonymous-boxes"/>
     <meta name="flags" content="" />
-  <body style="font-family: monospace">
+  <body style="font-family: monospace; white-space: nowrap">
     <!-- The test in the first row might not be correct, depending on spec
          clarifications -->
     <span style="display: table-row"> 
diff --git a/layout/reftests/table-anonymous-boxes/white-space-1.html b/layout/reftests/table-anonymous-boxes/white-space-1.html
index 0fac2860b0c..2a0d232b940 100644
--- a/layout/reftests/table-anonymous-boxes/white-space-1.html
+++ b/layout/reftests/table-anonymous-boxes/white-space-1.html
@@ -14,7 +14,7 @@
       }
     </script>
   </head>
-  <body style="font-family: monospace" onload="doTest()">
+  <body style="font-family: monospace; white-space: nowrap" onload="doTest()">
     <span style="display: table-cell">Row 1, Col 1</span>
     <span style="display: table-cell">Row 1, Col 2</span>
     <span style="display: table-cell" id="t">Row 1, Col 3</span>
