diff --git a/tooling/karaf-services-maven-plugin/src/main/java/org/apache/karaf/tooling/tracker/GenerateServiceMetadata.java b/tooling/karaf-services-maven-plugin/src/main/java/org/apache/karaf/tooling/tracker/GenerateServiceMetadata.java
index 4a12121..42b7543 100644
--- a/tooling/karaf-services-maven-plugin/src/main/java/org/apache/karaf/tooling/tracker/GenerateServiceMetadata.java
+++ b/tooling/karaf-services-maven-plugin/src/main/java/org/apache/karaf/tooling/tracker/GenerateServiceMetadata.java
@@ -92 +92,2 @@
-                if (classUrl == null || !classUrl.getPath().startsWith(project.getBuild().getOutputDirectory())) {
+                URL outputDirectoryUrl = new File(project.getBuild().getOutputDirectory()).toURI().toURL();
+                if (classUrl == null || !classUrl.getPath().startsWith(outputDirectoryUrl.getPath())) {