diff --git a/libdino/tests/testcase.vala b/libdino/tests/testcase.vala
index 87147604..59fcf193 100644
--- a/libdino/tests/testcase.vala
+++ b/libdino/tests/testcase.vala
@@ -48,7 +48,7 @@ public abstract class Gee.TestCase : Object {
     }
 
     public GLib.TestSuite get_suite () {
-        return this.suite;
+        return (owned) this.suite;
     }
 
     private class Adaptor {
diff --git a/plugins/signal-protocol/tests/testcase.vala b/plugins/signal-protocol/tests/testcase.vala
index 061ccc63..59fcf193 100644
--- a/plugins/signal-protocol/tests/testcase.vala
+++ b/plugins/signal-protocol/tests/testcase.vala
@@ -48,7 +48,7 @@ public abstract class Gee.TestCase : Object {
     }
 
     public GLib.TestSuite get_suite () {
-        return this.suite;
+        return (owned) this.suite;
     }
 
     private class Adaptor {
@@ -77,4 +77,4 @@ public abstract class Gee.TestCase : Object {
             this.test_case.tear_down ();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/xmpp-vala/tests/testcase.vala b/xmpp-vala/tests/testcase.vala
index 9bdf5f6b..178b6353 100644
--- a/xmpp-vala/tests/testcase.vala
+++ b/xmpp-vala/tests/testcase.vala
@@ -56,7 +56,7 @@ public abstract class Gee.TestCase : Object {
     }
 
     public GLib.TestSuite get_suite () {
-        return this.suite;
+        return (owned) this.suite;
     }
 }