diff --git a/lib/visualizers/sp-cpu-visualizer-row.c b/lib/visualizers/sp-cpu-visualizer-row.c
index 399fd257..b67fa0de 100644
--- a/lib/visualizers/sp-cpu-visualizer-row.c
+++ b/lib/visualizers/sp-cpu-visualizer-row.c
@@ -68,11 +68,10 @@ sp_cpu_visualizer_row_discover_counters (GTask        *task,
   const SpCaptureFrameType types[] = { SP_CAPTURE_FRAME_CTRDEF };
   SpCaptureReader *reader = task_data;
   g_autoptr(SpCaptureCursor) cursor = NULL;
-  SpCpuVisualizerRow *self = source_object;
   g_autoptr(GArray) counters = NULL;
 
   g_assert (G_IS_TASK (task));
-  g_assert (SP_IS_CPU_VISUALIZER_ROW (self));
+  g_assert (SP_IS_CPU_VISUALIZER_ROW (source_object));
   g_assert (reader != NULL);
 
   counters = g_array_new (FALSE, FALSE, sizeof (guint));
diff --git a/lib/widgets/sp-profiler-menu-button.c b/lib/widgets/sp-profiler-menu-button.c
index f0c77faa..59da80c3 100644
--- a/lib/widgets/sp-profiler-menu-button.c
+++ b/lib/widgets/sp-profiler-menu-button.c
@@ -332,10 +332,9 @@ sp_profiler_menu_button_create_row (gpointer itemptr,
                                     gpointer user_data)
 {
   SpProcessModelItem *item = itemptr;
-  SpProfilerMenuButton *self = user_data;
 
   g_assert (SP_IS_PROCESS_MODEL_ITEM (item));
-  g_assert (SP_IS_PROFILER_MENU_BUTTON (self));
+  g_assert (SP_IS_PROFILER_MENU_BUTTON (user_data));
 
   return g_object_new (SP_TYPE_PROCESS_MODEL_ROW,
                        "item", item,