diff --git a/api/src/org/labkey/api/util/PageFlowUtil.java b/api/src/org/labkey/api/util/PageFlowUtil.java
index 71f1a027cb7..5b2304ddac7 100644
--- a/api/src/org/labkey/api/util/PageFlowUtil.java
+++ b/api/src/org/labkey/api/util/PageFlowUtil.java
@@ -3149,7 +3149,7 @@ public void encodePath()
 
         private void assertEncodeDecode(String test)
         {
-            assertFalse(StringUtils.containsAny(encodeFormName(test), "\\\"%"));
+            assertFalse(StringUtils.containsAny(encodeFormName(test), "\\\""));
             assertEquals(test, decodeFormName(encodeFormName(test)));
         }
 
@@ -3158,8 +3158,8 @@ private void assertReencode(String a)
             // We want to make sure there are no ambiguous encodings
             var b = encodeFormName(a);
             var c = encodeFormName(b);
-            assertFalse(StringUtils.containsAny(b, "\\\"%"));
-            assertFalse(StringUtils.containsAny(c, "\\\"%"));
+            assertFalse(StringUtils.containsAny(b, "\\\""));
+            assertFalse(StringUtils.containsAny(c, "\\\""));
             if (a.equals(b))
                 assertEquals(a,c);
             else