diff --git a/panda/src/gui/guiButton.cxx b/panda/src/gui/guiButton.cxx
index 69b9671676..2f45aa1d16 100644
--- a/panda/src/gui/guiButton.cxx
+++ b/panda/src/gui/guiButton.cxx
@@ -285,7 +285,7 @@ void GuiButton::adjust_region(void) {
 	     _right, _bottom, _top);
   gui_cat->debug() << "in adjust_region, base values (" << _left << ", "
 		   << _right << ", " << _bottom << ", " << _top << ")" << endl;
-  if (_alt_root.is_null()) {
+  if (!(_alt_root.is_null())) {
     // adjust for graph transform
     LMatrix4f m;
     this->get_graph_mat(m);
diff --git a/panda/src/gui/guiRollover.cxx b/panda/src/gui/guiRollover.cxx
index 71ca337e48..0f748c72d0 100644
--- a/panda/src/gui/guiRollover.cxx
+++ b/panda/src/gui/guiRollover.cxx
@@ -70,7 +70,7 @@ void GuiRollover::adjust_region(void) {
   GetExtents(_off, _on, _left, _right, _bottom, _top);
   gui_cat->debug() << "in adjust_region, base values (" << _left << ", "
 		   << _right << ", " << _bottom << ", " << _top << ")" << endl;
-  if (_alt_root.is_null()) {
+  if (!(_alt_root.is_null())) {
     // adjust for graph transform
     LMatrix4f m;
     this->get_graph_mat(m);