diff --git a/subprojects/memcard/src/memorycard.cpp b/subprojects/memcard/src/memorycard.cpp
index 5aa2dd9..073d9f3 100644
--- a/subprojects/memcard/src/memorycard.cpp
+++ b/subprojects/memcard/src/memorycard.cpp
@@ -62,7 +62,9 @@ std::size_t MemoryCard::size() const {
 	return std::count_if(
 		const_iterator(this, 0),
 		const_iterator(this, 15),
-		[](const auto& blk) {return blk.has_magic();}
+		[](const auto& blk) {
+			return (blk.available_blocks() & 0xF) != 0 and (blk.available_blocks() & 0xF) != 0xF;
+		}
 	);
 }