diff --git a/gtk/gtkbitmaskprivateimpl.h b/gtk/gtkbitmaskprivateimpl.h
index 0dea65abe7..c46fa9622c 100644
--- a/gtk/gtkbitmaskprivateimpl.h
+++ b/gtk/gtkbitmaskprivateimpl.h
@@ -159,8 +159,8 @@ static inline gboolean
 _gtk_bitmask_intersects (const GtkBitmask *mask,
                          const GtkBitmask *other)
 {
-  if (!_gtk_bitmask_is_allocated (mask) ||
-      !_gtk_bitmask_is_allocated (other))
+  if (_gtk_bitmask_is_allocated (mask) ||
+      _gtk_bitmask_is_allocated (other))
     return _gtk_allocated_bitmask_intersects (mask, other);
   else
     return _gtk_bitmask_to_bits (mask) & _gtk_bitmask_to_bits (other);