diff --git a/src/script/squirrel.cpp b/src/script/squirrel.cpp
index ea63944ea9..275a89c74c 100644
--- a/src/script/squirrel.cpp
+++ b/src/script/squirrel.cpp
@@ -93,6 +93,7 @@ struct ScriptAllocator {
 	{
 		if (p == nullptr) return;
 		free(p);
+		this->allocated_size -= size;
 
 #ifdef SCRIPT_DEBUG_ALLOCATIONS
 		assert(this->allocations.at(p) == size);