diff --git a/src/buttons.c b/src/buttons.c
index 12f0e47b..50cdde09 100644
--- a/src/buttons.c
+++ b/src/buttons.c
@@ -1595,6 +1595,7 @@ void Button_Page(void)
 
   SWAP_BYTES (Main_current_layer,Spare_current_layer)
   SWAP_DWORDS(Main_layers_visible,Spare_layers_visible)
+  SWAP_DWORDS(Main_layers_visible_backup,Spare_layers_visible_backup)
   
   SWAP_DWORDS(Main_safety_number,Spare_safety_number)
   SWAP_DWORDS(Main_edits_since_safety_backup,Spare_edits_since_safety_backup)
diff --git a/src/global.h b/src/global.h
index 71ed5bb5..069cf783 100644
--- a/src/global.h
+++ b/src/global.h
@@ -327,6 +327,8 @@ GFX2_GLOBAL short Main_magnifier_offset_Y;
 GFX2_GLOBAL int Main_current_layer;
 /// Bitfield that records which layers are visible. 2^0 for 0, 2^1 for 1, 2^2 for 2, etc.
 GFX2_GLOBAL dword Main_layers_visible;
+/// Backup for Main_layers_visible
+GFX2_GLOBAL dword Main_layers_visible_backup;
 /// Index to use next time, when creating incremental backups, to make unique filename.
 GFX2_GLOBAL long Main_safety_number;
 /// Number of edit actions since the last safety backup
@@ -382,6 +384,8 @@ GFX2_GLOBAL short Spare_magnifier_offset_Y;
 GFX2_GLOBAL int Spare_current_layer;
 /// Bitfield that records which layers are visible. 2^0 for 0, 2^1 for 1, 2^2 for 2, etc.
 GFX2_GLOBAL dword Spare_layers_visible;
+/// Backup for Spare_layers_visible
+GFX2_GLOBAL dword Spare_layers_visible_backup;
 /// Index to use next time, when creating incremental backups, to make unique filename.
 GFX2_GLOBAL long Spare_safety_number;
 /// Number of edit actions since the last safety backup
diff --git a/src/layers.c b/src/layers.c
index 9a0dbd14..cefa95c6 100644
--- a/src/layers.c
+++ b/src/layers.c
@@ -35,7 +35,6 @@
 void Layer_activate(int layer, short side)
 {
   dword old_layers;
-  static dword layers_backup_for_toggle = 0xFFFFFFFF;
 
   if (layer >= Main_backups->Pages->Nb_layers)
     return;
@@ -54,12 +53,12 @@ void Layer_activate(int layer, short side)
         {
           // return to previous state (layers that were on before showing
           // only this one)
-          Main_layers_visible = layers_backup_for_toggle;
+          Main_layers_visible = Main_layers_visible_backup;
         }
         else
         {
           // Set only this one visible
-          layers_backup_for_toggle = Main_layers_visible;
+          Main_layers_visible_backup = Main_layers_visible;
           Main_layers_visible = 1<<layer;
         }
       }
diff --git a/src/main.c b/src/main.c
index ac92bd74..e2a659f0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -523,8 +523,10 @@ int Init_program(int argc,char * argv[])
   
   Main_current_layer=0;
   Main_layers_visible=0xFFFFFFFF;
+  Main_layers_visible_backup=0xFFFFFFFF;
   Spare_current_layer=0;
   Spare_layers_visible=0xFFFFFFFF;
+  Spare_layers_visible_backup=0xFFFFFFFF;
   
   Spare_selector.Position=0;
   Spare_selector.Offset=0;