diff --git a/src/main/java/makamys/coretweaks/optimization/PrefixedClasspathResourceAccelerator.java b/src/main/java/makamys/coretweaks/optimization/PrefixedClasspathResourceAccelerator.java
index 315d99b..9709fa7 100644
--- a/src/main/java/makamys/coretweaks/optimization/PrefixedClasspathResourceAccelerator.java
+++ b/src/main/java/makamys/coretweaks/optimization/PrefixedClasspathResourceAccelerator.java
@@ -15,6 +15,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
@@ -39,7 +40,7 @@ public class PrefixedClasspathResourceAccelerator {
     private void init() {
         long t0 = System.nanoTime();
         classSources = new ArrayList<>();
-        for(URL url : Launch.classLoader.getSources()) {
+        for(URL url : Launch.classLoader.getSources().stream().distinct().collect(Collectors.toList())) {
             try {
                 classSources.add(Index.fromURL(url));
             } catch(Exception e) {