diff --git a/aegisub/src/block_cache.h b/aegisub/src/block_cache.h
index 69cf3e464..db7b83edc 100644
--- a/aegisub/src/block_cache.h
+++ b/aegisub/src/block_cache.h
@@ -199,7 +199,7 @@ public:
 		{
 			size_t block_count = data.size();
 			data.clear();
-			SetBlockCount(block_count);
+			data.resize(block_count);
 			age.clear();
 			return;
 		}