diff --git a/subprojects/memcard/include/memcard/block.hpp b/subprojects/memcard/include/memcard/block.hpp
index d4cf491..97e1f75 100644
--- a/subprojects/memcard/include/memcard/block.hpp
+++ b/subprojects/memcard/include/memcard/block.hpp
@@ -23,6 +23,8 @@ class BasicBlock {
 public:
 	using data_type = typename std::conditional<Const, const uint8_t, uint8_t>::type;
 
+	static const constexpr unsigned int FrameSize = 128;
+
 	explicit BasicBlock (data_type* beg);
 	~BasicBlock();
 
@@ -36,7 +38,7 @@ public:
 	data_type* frame(unsigned int idx);
 	const data_type* frame(unsigned int idx) const;
 
-	static constexpr std::size_t size() { return 8192; }
+	static constexpr std::size_t size() { return FrameSize * 64; }
 
 	const std::vector<uint8_t>& palette() const { return m_icon_palette; }
 	bool has_magic() const;
diff --git a/subprojects/memcard/src/block.cpp b/subprojects/memcard/src/block.cpp
index 5410a6c..a85f94b 100644
--- a/subprojects/memcard/src/block.cpp
+++ b/subprojects/memcard/src/block.cpp
@@ -92,9 +92,8 @@ auto BasicBlock<Const>::frame(unsigned int idx) -> data_type* {
 
 template <bool Const>
 auto BasicBlock<Const>::frame(unsigned int idx) const -> const data_type* {
-	const constexpr unsigned int framesize = 128;
-	assert(idx * framesize + framesize <= this->size());
-	return this->begin() + framesize * idx;
+	assert(idx * FrameSize + FrameSize <= this->size());
+	return this->begin() + FrameSize * idx;
 }
 
 template <bool Const>