diff --git a/maven-plugins/bnd-indexer-maven-plugin/src/main/java/aQute/bnd/maven/indexer/plugin/IndexerMojo.java b/maven-plugins/bnd-indexer-maven-plugin/src/main/java/aQute/bnd/maven/indexer/plugin/IndexerMojo.java
index e45e78f663..8f8953dbe3 100644
--- a/maven-plugins/bnd-indexer-maven-plugin/src/main/java/aQute/bnd/maven/indexer/plugin/IndexerMojo.java
+++ b/maven-plugins/bnd-indexer-maven-plugin/src/main/java/aQute/bnd/maven/indexer/plugin/IndexerMojo.java
@@ -178,6 +178,12 @@ public void execute() throws MojoExecutionException, MojoFailureException {
 			IO.mkdirs(outputFile.getParentFile());
 			for (Entry<File, ArtifactResult> entry : dependencies.entrySet()) {
 				File file = entry.getKey();
+
+				if (!"jar".equals(entry.getValue().getArtifact().getExtension())) {
+					logger.debug("Skipping: {}", file);
+					continue;
+				}
+
 				ResourceBuilder resourceBuilder = new ResourceBuilder();
 				resourceBuilder.addFile(entry.getKey(), repositoryURLResolver.resolver(file, entry.getValue()));