diff --git a/src/main/java/amidst/clazz/real/RealClasses.java b/src/main/java/amidst/clazz/real/RealClasses.java
index 58000d470..b57f1e254 100644
--- a/src/main/java/amidst/clazz/real/RealClasses.java
+++ b/src/main/java/amidst/clazz/real/RealClasses.java
@@ -31,7 +31,7 @@ private static List<RealClass> readRealClassesFromJarFile(Path jarFile)
 			throw new FileNotFoundException("Attempted to load jar file at: " + jarFile + " but it does not exist.");
 		}
 
-		try (FileSystem jarContents = URIUtils.openZipFile(jarFile.toUri())){
+		try (FileSystem jarContents = URIUtils.openZipFile(jarFile)){
 			return readJarFile(jarContents);
 		} catch (IOException | RealClassCreationException | URISyntaxException e) {
 			throw new JarFileParsingException("Error extracting jar data.", e);
diff --git a/src/main/java/amidst/parsing/URIUtils.java b/src/main/java/amidst/parsing/URIUtils.java
index 458264397..61b0e69c6 100644
--- a/src/main/java/amidst/parsing/URIUtils.java
+++ b/src/main/java/amidst/parsing/URIUtils.java
@@ -11,7 +11,7 @@
 import java.net.URL;
 import java.nio.file.FileSystem;
 import java.nio.file.FileSystems;
-import java.util.HashMap;
+import java.nio.file.Path;
 
 import amidst.documentation.Immutable;
 
@@ -55,8 +55,7 @@ public static byte[] readBytes(URL url) throws IOException {
 		return bytes.toByteArray();
 	}
 
-	public static FileSystem openZipFile(URI uri) throws URISyntaxException, IOException {
-		URI zipUri = new URI("jar:" + uri.getScheme(), uri.getPath(), null);
-		return FileSystems.newFileSystem(zipUri, new HashMap<>());
+	public static FileSystem openZipFile(Path path) throws URISyntaxException, IOException {
+		return FileSystems.newFileSystem(path, null);
 	}
 }