diff --git a/bramble-core/src/test/java/org/briarproject/bramble/db/DatabasePerformanceComparisonTest.java b/bramble-core/src/test/java/org/briarproject/bramble/db/DatabasePerformanceComparisonTest.java
index 279d1b56e6e0ae44fdb1929a37154a7af6c854e9..3f5657d11d03a9b7b616163a9a7a5eb952e87189 100644
--- a/bramble-core/src/test/java/org/briarproject/bramble/db/DatabasePerformanceComparisonTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/db/DatabasePerformanceComparisonTest.java
@@ -1,5 +1,6 @@
 package org.briarproject.bramble.db;
 
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.system.Clock;
@@ -26,6 +27,7 @@ public abstract class DatabasePerformanceComparisonTest
 	 * How many blocks of each condition to compare.
 	 */
 	private static final int COMPARISON_BLOCKS = 10;
+	private SecretKey databaseKey = getSecretKey();
 
 	abstract Database<Connection> createDatabase(boolean conditionA,
 			DatabaseConfig databaseConfig, Clock clock);
@@ -72,7 +74,7 @@ public abstract class DatabasePerformanceComparisonTest
 			throws DbException {
 		Database<Connection> db = createDatabase(conditionA,
 				new TestDatabaseConfig(testDir, MAX_SIZE), new SystemClock());
-		db.open(getSecretKey(), null);
+		db.open(databaseKey, null);
 		return db;
 	}
 
diff --git a/bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseTraceTest.java b/bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseTraceTest.java
index 2060ca71ec35807190e04518fe123e257fbc6a59..cf90b7fd09ef9c673631f706b57677edc92eda93 100644
--- a/bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseTraceTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseTraceTest.java
@@ -1,5 +1,6 @@
 package org.briarproject.bramble.db;
 
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.system.Clock;
@@ -20,6 +21,8 @@ import static org.briarproject.bramble.test.TestUtils.getSecretKey;
 
 public abstract class DatabaseTraceTest extends DatabasePerformanceTest {
 
+	private SecretKey databaseKey = getSecretKey();
+
 	abstract Database<Connection> createDatabase(DatabaseConfig databaseConfig,
 			Clock clock);
 
@@ -44,7 +47,7 @@ public abstract class DatabaseTraceTest extends DatabasePerformanceTest {
 	private Database<Connection> openDatabase() throws DbException {
 		Database<Connection> db = createDatabase(
 				new TestDatabaseConfig(testDir, MAX_SIZE), new SystemClock());
-		db.open(getSecretKey(), null);
+		db.open(databaseKey, null);
 		return db;
 	}
 
diff --git a/bramble-core/src/test/java/org/briarproject/bramble/db/SingleDatabasePerformanceTest.java b/bramble-core/src/test/java/org/briarproject/bramble/db/SingleDatabasePerformanceTest.java
index 6256d39cd07c51d5ee2bba18983fdecef20f41c1..1b93b1f1e306f577cb36db29dcbb06bc2725a713 100644
--- a/bramble-core/src/test/java/org/briarproject/bramble/db/SingleDatabasePerformanceTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/db/SingleDatabasePerformanceTest.java
@@ -1,5 +1,6 @@
 package org.briarproject.bramble.db;
 
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.system.Clock;
@@ -22,6 +23,8 @@ public abstract class SingleDatabasePerformanceTest
 	abstract Database<Connection> createDatabase(DatabaseConfig databaseConfig,
 			Clock clock);
 
+	private SecretKey databaseKey = getSecretKey();
+
 	@Override
 	protected void benchmark(String name,
 			BenchmarkTask<Database<Connection>> task) throws Exception {
@@ -41,7 +44,7 @@ public abstract class SingleDatabasePerformanceTest
 	private Database<Connection> openDatabase() throws DbException {
 		Database<Connection> db = createDatabase(
 				new TestDatabaseConfig(testDir, MAX_SIZE), new SystemClock());
-		db.open(getSecretKey(), null);
+		db.open(databaseKey, null);
 		return db;
 	}