diff --git a/src/block.h b/src/block.h
index 13daea1..e5dbd8d 100644
--- a/src/block.h
+++ b/src/block.h
@@ -59,7 +59,7 @@ class block {
 
  private:
   static const unsigned max_block_size_ = 16350;
-  static const unsigned max_lines_per_block_ = 128;
+  static const unsigned max_lines_per_block_ = 64;
 
   std::vector<std::vector<uint8_t>> lines_;
   int line_bytes_;
diff --git a/test/test_block.cc b/test/test_block.cc
index e5fd103..c476ee7 100644
--- a/test/test_block.cc
+++ b/test/test_block.cc
@@ -37,10 +37,10 @@ const lest::test specification[] = {
     EXPECT(!b.empty());
   },
 
-  "A block can contain 128 lines",
+  "A block can contain 64 lines",
   [] {
     block b;
-    for (int i = 0; i < 128; ++i) {
+    for (int i = 0; i < 64; ++i) {
       EXPECT(b.line_fits(1));
       b.add_line(vec(1));
     }