diff --git a/ch.obermuhlner.scriptengine.java/src/main/java/ch/obermuhlner/scriptengine/java/MemoryClassLoader.java b/ch.obermuhlner.scriptengine.java/src/main/java/ch/obermuhlner/scriptengine/java/MemoryClassLoader.java
index ce89152..b715b79 100644
--- a/ch.obermuhlner.scriptengine.java/src/main/java/ch/obermuhlner/scriptengine/java/MemoryClassLoader.java
+++ b/ch.obermuhlner.scriptengine.java/src/main/java/ch/obermuhlner/scriptengine/java/MemoryClassLoader.java
@@ -36,10 +36,10 @@ public MemoryClassLoader(Map<String, byte[]> mapClassBytes, ClassLoader parent)
         this.mapClassBytes = mapClassBytes;
 
         try {
-            URL url = new URL(MEMORY_CLASS_URL);
+            URL url = new java.net.URI(MEMORY_CLASS_URL).toURL();
             CodeSource codeSource = new CodeSource(url, (Certificate[]) null);
             protectionDomain = new ProtectionDomain(codeSource, null, this, new Principal[0]);
-        } catch (MalformedURLException e) {
+        } catch (URISyntaxException | MalformedURLException e) {
             throw new RuntimeException(e);
         }
     }