diff --git a/file.hpp b/file.hpp
index dd44f23..755aa8b 100644
--- a/file.hpp
+++ b/file.hpp
@@ -53,12 +53,12 @@ public:
 		if(b == nullptr) return a;
 
 		if(a->priority < b->priority) {
-			a->size += b->size;
+			a->size += get_size(b);
 			a->right = join(a->right, b);
 			return a;
 		}
 		else {
-			b->size += a->size;
+			b->size += get_size(a);
 			b->left = join(a, b->left);
 			return b;
 		}