diff --git a/bosk-mongo/src/test/java/io/vena/bosk/drivers/mongo/SchemaEvolutionTest.java b/bosk-mongo/src/test/java/io/vena/bosk/drivers/mongo/SchemaEvolutionTest.java
index 3054ffc1..3d6052e0 100644
--- a/bosk-mongo/src/test/java/io/vena/bosk/drivers/mongo/SchemaEvolutionTest.java
+++ b/bosk-mongo/src/test/java/io/vena/bosk/drivers/mongo/SchemaEvolutionTest.java
@@ -162,7 +162,7 @@ static final class Helper extends AbstractMongoDriverTest {
 
 		public Helper(DatabaseFormat preferredFormat, ManifestMode manifestMode) {
 			super(MongoDriverSettings.builder()
-				.database(SchemaEvolutionTest.class.getSimpleName())
+				.database(SchemaEvolutionTest.class.getSimpleName() + "_" + DB_COUNTER.incrementAndGet())
 				.preferredDatabaseFormat(preferredFormat)
 				.experimental(Experimental.builder()
 					.manifestMode(manifestMode)
@@ -181,5 +181,6 @@ public interface Refs {
 		@ReferencePath("/string") Reference<String> string();
 	}
 
+	private static final AtomicInteger DB_COUNTER = new AtomicInteger(0);
 	private static final Logger LOGGER = LoggerFactory.getLogger(SchemaEvolutionTest.class);
 }