diff --git a/src/item.cpp b/src/item.cpp
index e5360505264b9..f28c2e97c1619 100644
--- a/src/item.cpp
+++ b/src/item.cpp
@@ -1278,6 +1278,7 @@ void item::update_modified_pockets()
     std::optional<const pocket_data *> mag_or_mag_well;
     std::vector<const pocket_data *> container_pockets;
 
+    // Prevent cleanup of pockets belonging to the item base type
     for( const pocket_data &pocket : type->pockets ) {
         if( pocket.type == pocket_type::CONTAINER ) {
             container_pockets.push_back( &pocket );
@@ -1287,6 +1288,13 @@ void item::update_modified_pockets()
         }
     }
 
+    // Prevent cleanup of added modular pockets
+    for( const item *it : contents.get_added_pockets() ) {
+        for( const pocket_data &pocket : it->type->pockets ) {
+            container_pockets.push_back( &pocket );
+        }
+    }
+
     for( const item *mod : mods() ) {
         if( mod->type->mod ) {
             for( const pocket_data &pocket : mod->type->mod->add_pockets ) {