diff --git a/src/main/java/com/google/devtools/build/lib/analysis/test/InstrumentedFilesCollector.java b/src/main/java/com/google/devtools/build/lib/analysis/test/InstrumentedFilesCollector.java
index d2f5926d715c73..39aa12d2a682ec 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/test/InstrumentedFilesCollector.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/test/InstrumentedFilesCollector.java
@@ -208,7 +208,7 @@ public static InstrumentedFilesInfo collect(
       for (TransitiveInfoCollection dep :
           getPrerequisitesForAttributes(ruleContext, spec.sourceAttributes)) {
         for (Artifact artifact : dep.getProvider(FileProvider.class).getFilesToBuild().toList()) {
-          if (artifact.isSourceArtifact() &&
+          if (!artifact.isDirectory() &&
               spec.instrumentedFileTypes.matches(artifact.getFilename())) {
             localSourcesBuilder.add(artifact);
           }