diff --git a/Makefile b/Makefile
index a9f6c13..775afdb 100644
--- a/Makefile
+++ b/Makefile
@@ -29,6 +29,7 @@ COMMON = \
 	 profiling.cc \
 	 shaders.cc \
 	 odbg.cc \
+	 undo.cc \
 	 \
 	 sync.cc \
 	 syncoverrides.cc \
@@ -45,7 +46,6 @@ DEMO = \
 	 main.cc \
 	 syncedit.cc \
 	 syncview.cc \
-	 undo.cc \
 # END DEMO
 
 PARSERCHECK = \
diff --git a/undo.cc b/undo.cc
index db449f9..58e6c02 100644
--- a/undo.cc
+++ b/undo.cc
@@ -10,6 +10,13 @@ A_UndoAction::~A_UndoAction( )
 
 /*= T_UndoManager ==============================================================*/
 
+T_UndoManager::T_UndoManager( ) noexcept
+{
+	while ( actions_.size( ) < MaxUndo ) {
+		actions_.addNew( );
+	}
+}
+
 void T_UndoManager::undo( ) noexcept
 {
 	if ( pos_ > 0 ) {
@@ -21,8 +28,8 @@ void T_UndoManager::undo( ) noexcept
 void T_UndoManager::redo( ) noexcept
 {
 	if ( pos_ < count_ ) {
-		pos_ ++;
 		actions_[ ( start_ + pos_ ) % MaxUndo ]->redo( );
+		pos_ ++;
 	}
 }
 
diff --git a/undo.hh b/undo.hh
index c0462ae..abca968 100644
--- a/undo.hh
+++ b/undo.hh
@@ -27,7 +27,7 @@ class T_UndoManager
 	uint32_t pos_{ 0 };
 
     public:
-	T_UndoManager( ) noexcept = default;
+	T_UndoManager( ) noexcept;
 	DEF_MOVE( T_UndoManager );
 	NO_COPY( T_UndoManager );