diff --git a/pandatool/src/eggcharbase/eggMatrixTablePointer.cxx b/pandatool/src/eggcharbase/eggMatrixTablePointer.cxx
index 98281cb6b5..a8a987f3db 100644
--- a/pandatool/src/eggcharbase/eggMatrixTablePointer.cxx
+++ b/pandatool/src/eggcharbase/eggMatrixTablePointer.cxx
@@ -93,6 +93,7 @@ extend_to(int num_frames) {
 
   while (num_rows < num_frames) {
     _xform->add_data(last_mat);
+    num_rows++;
   }
 }
 
diff --git a/pandatool/src/eggcharbase/eggScalarTablePointer.cxx b/pandatool/src/eggcharbase/eggScalarTablePointer.cxx
index a8f3d34367..5305badfe8 100644
--- a/pandatool/src/eggcharbase/eggScalarTablePointer.cxx
+++ b/pandatool/src/eggcharbase/eggScalarTablePointer.cxx
@@ -65,6 +65,7 @@ extend_to(int num_frames) {
 
   while (num_rows < num_frames) {
     _data->add_data(last_value);
+    num_rows++;
   }
 }