diff --git a/code/DataObjectManager.php b/code/DataObjectManager.php
index 264d30f..f7c6d2a 100644
--- a/code/DataObjectManager.php
+++ b/code/DataObjectManager.php
@@ -315,7 +315,7 @@ public function Headings()
 				)),
 				"SortDirection" => $dir,
 			  "IsSorted" => (isset($_REQUEST['ctf'][$this->Name()]['sort'])) && ($_REQUEST['ctf'][$this->Name()]['sort'] == $fieldName),
-				"ColumnWidthCSS" => !empty($this->column_widths) ? sprintf("style='width:%f%%;'",($this->column_widths[$fieldName] - 0.1)) : ""
+				"ColumnWidthCSS" => !empty($this->column_widths) ? sprintf("style='width:%F%%;'",($this->column_widths[$fieldName] - 0.1)) : ""
 			));
 		}
 		return new DataObjectSet($headings);
@@ -660,7 +660,7 @@ function Fields() {
 		$widths = $this->parent->getColumnWidths();
 		if(!empty($widths)) {
 			foreach($fields as $field) {
-				$field->ColumnWidthCSS = sprintf("style='width:%f%%;'",($widths[$field->Name] - 0.1));
+				$field->ColumnWidthCSS = sprintf("style='width:%F%%;'",($widths[$field->Name] - 0.1));
 			}
 		}
 		return $fields;		
diff --git a/code/DataObjectManager_nestedurls.php b/code/DataObjectManager_nestedurls.php
index 3ec5c40..35a2190 100644
--- a/code/DataObjectManager_nestedurls.php
+++ b/code/DataObjectManager_nestedurls.php
@@ -153,7 +153,7 @@ public function Headings()
 				)),
 				"SortDirection" => $dir,
 			  "IsSorted" => (isset($_REQUEST['ctf'][$this->Name()]['sort'])) && ($_REQUEST['ctf'][$this->Name()]['sort'] == $fieldName),
-				"ColumnWidthCSS" => !empty($this->column_widths) ? sprintf("style='width:%f%%;'",($this->column_widths[$fieldName] - 0.1)) : ""
+				"ColumnWidthCSS" => !empty($this->column_widths) ? sprintf("style='width:%F%%;'",($this->column_widths[$fieldName] - 0.1)) : ""
 			));
 		}
 		return new DataObjectSet($headings);
@@ -380,7 +380,7 @@ function Fields() {
 		$widths = $this->parent->getColumnWidths();
 		if(!empty($widths)) {
 			foreach($fields as $field) {
-				$field->ColumnWidthCSS = sprintf("style='width:%f%%;'",($widths[$field->Name] - 0.1));
+				$field->ColumnWidthCSS = sprintf("style='width:%F%%;'",($widths[$field->Name] - 0.1));
 			}
 		}
 		return $fields;