2 files changed, 3 insertions, 2 deletions
diff --git a/src/knot.cpp b/src/knot.cpp
index 3194336ed..01b1bafa2 100644
--- a/src/knot.cpp
+++ b/src/knot.cpp
@@ -97,7 +97,7 @@ GType sp_knot_get_type()
  */
 static void sp_knot_class_init(SPKnotClass *klass)
 {
-    GObjectClass *object_class = klass;
+    GObjectClass *object_class = (GObjectClass*)klass;
 
     parent_class = (GObjectClass*) g_type_class_peek_parent(klass);
 
diff --git a/src/knot.h b/src/knot.h
index 3df85014f..ceeca0169 100644
--- a/src/knot.h
+++ b/src/knot.h
@@ -113,7 +113,8 @@ struct SPKnot : GObject {
 };
 
 /// The SPKnot vtable.
-struct SPKnotClass : GObjectClass {
+struct SPKnotClass {
+    GObjectClass parent_class;
     gint (* event) (SPKnot *knot, GdkEvent *event);
 
     /*