diff --git a/org.bridgedb.bio/src/test/java/org/bridgedb/bio/UniProtKBTest.java b/org.bridgedb.bio/src/test/java/org/bridgedb/bio/UniProtKBTest.java
index 67cec09d..1e639458 100644
--- a/org.bridgedb.bio/src/test/java/org/bridgedb/bio/UniProtKBTest.java
+++ b/org.bridgedb.bio/src/test/java/org/bridgedb/bio/UniProtKBTest.java
@@ -21,7 +21,7 @@ public class UniProtKBTest {
 
 	@BeforeAll
 	public static void setUpSources() {
-		DataSourceTxt.init();
+		if (DataSource.getDataSources().size() < 20) DataSourceTxt.init();
 	}
 
 	@Test