diff --git a/fclauncher/InstanceManager.go b/fclauncher/InstanceManager.go
index 56e1ce7..e645825 100644
--- a/fclauncher/InstanceManager.go
+++ b/fclauncher/InstanceManager.go
@@ -353,7 +353,8 @@ common:
 		pkg := tokens[len(tokens)-2]
 		instanceObject.Libraries = append(instanceObject.Libraries, filepath.Join(ProcessMavenPath(lib.Name), ProcessMavenFilename(lib.Name)))
 		for ind, path := range instanceObject.Libraries {
-			tokens := strings.Split(path, "/")
+			tokens := strings.Split(path, string(os.PathSeparator))
+			fmt.Printf("Inspecing path %s with %d tokens", path, len(tokens))
 			if pkg == tokens[len(tokens)-3] {
 				instanceObject.Libraries[ind] = filepath.Join(ProcessMavenPath(lib.Name), ProcessMavenFilename(lib.Name))
 				fmt.Printf("duplicate library %s\n", pkg)
@@ -411,7 +412,7 @@ common:
 		pkg := tokens[len(tokens)-2]
 		instanceObject.Libraries = append(instanceObject.Libraries, filepath.Join(ProcessMavenPath(lib.Name), ProcessMavenFilename(lib.Name)))
 		for ind, path := range instanceObject.Libraries {
-			tokens := strings.Split(path, "/")
+			tokens := strings.Split(path, string(os.PathSeparator))
 			if pkg == tokens[len(tokens)-3] {
 				instanceObject.Libraries[ind] = filepath.Join(ProcessMavenPath(lib.Name), ProcessMavenFilename(lib.Name))
 				fmt.Printf("duplicate library %s\n", pkg)