diff --git a/gio/tests/gsubprocess.c b/gio/tests/gsubprocess.c
index 7e22678ec..9c7898806 100644
--- a/gio/tests/gsubprocess.c
+++ b/gio/tests/gsubprocess.c
@@ -771,7 +771,7 @@ test_communicate_async (gconstpointer test_data)
   GSubprocessFlags flags = GPOINTER_TO_INT (test_data);
   GError *error = NULL;
   GPtrArray *args;
-  TestAsyncCommunicateData data = { flags, 0, };
+  TestAsyncCommunicateData data = { flags, 0, 0, NULL };
   GSubprocess *proc;
   GCancellable *cancellable = NULL;
   GBytes *input;
@@ -1022,7 +1022,7 @@ test_communicate_utf8_async (gconstpointer test_data)
   GSubprocessFlags flags = GPOINTER_TO_INT (test_data);
   GError *error = NULL;
   GPtrArray *args;
-  TestAsyncCommunicateData data = { flags, 0, };
+  TestAsyncCommunicateData data = { flags, 0, 0, NULL };
   GSubprocess *proc;
   GCancellable *cancellable = NULL;
 
@@ -1055,7 +1055,7 @@ test_communicate_utf8_cancelled_async (gconstpointer test_data)
   GSubprocessFlags flags = GPOINTER_TO_INT (test_data);
   GError *error = NULL;
   GPtrArray *args;
-  TestAsyncCommunicateData data = { flags, 0, };
+  TestAsyncCommunicateData data = { flags, 0, 0, NULL };
   GSubprocess *proc;
   GCancellable *cancellable = NULL;
 
@@ -1199,7 +1199,7 @@ test_communicate_utf8_async_invalid (void)
   GSubprocessFlags flags = G_SUBPROCESS_FLAGS_STDOUT_PIPE;
   GError *error = NULL;
   GPtrArray *args;
-  TestAsyncCommunicateData data = { flags, 0, };
+  TestAsyncCommunicateData data = { flags, 0, 0, NULL };
   GSubprocess *proc;
   GCancellable *cancellable = NULL;