diff --git a/testsuite/css/data.c b/testsuite/css/data.c
index 2f623df128..3ecac4e3cb 100644
--- a/testsuite/css/data.c
+++ b/testsuite/css/data.c
@@ -52,6 +52,9 @@ Test tests[] = {
   { "charset",
     "data:text/plain;charset=ISO-8859-1,Timm B\344der",
     "text/plain", CONTENTS("Timm Bäder") },
+  { "charset",
+    "data:text/plain;charset=ISO-8859-1,Timm%20B%E4der",
+    "text/plain", CONTENTS("Timm Bäder") },
   { "charset_base64",
     "data:text/plain;charset=ISO-8859-5;base64,wOPh29DdILjW0ePb0OLe0g==",
     "text/plain", CONTENTS("Руслан Ижбулатов") },