diff --git a/src/CSPBuilder.php b/src/CSPBuilder.php
index c0d619c..dc4b39f 100644
--- a/src/CSPBuilder.php
+++ b/src/CSPBuilder.php
@@ -500,7 +500,7 @@ protected function compileSubgroup($directive, $policies = null)
             $ret .= "'unsafe-inline' ";
         }
         if (!empty($policies['unsafe-eval'])) {
-            $ret .= "'unsafe-eval'";
+            $ret .= "'unsafe-eval' ";
         }
         if (!empty($policies['data'])) {
             $ret .= "data: ";