diff --git src/common.cc src/common.cc
index 203afdf..9257518 100644
--- src/common.cc
+++ src/common.cc
@@ -79,7 +79,7 @@ int AlignmentForSize(size_t size) {
   if (size > kMaxSize) {
     // Cap alignment at kPageSize for large sizes.
     alignment = kPageSize;
-  } else if (size >= 128) {
+  } else if (size >= 512) {
     // Space wasted due to alignment is at most 1/8, i.e., 12.5%.
     alignment = (1 << LgFloor(size)) / 8;
   } else if (size >= kMinAlign) {
diff --git a/src/common.h b/src/common.h
index cb45315..4131a13 100644
--- src/common.h
+++ src/common.h
@@ -61,7 +61,7 @@ typedef uintptr_t Length;
 // waste due alignment of 25%. (eg malloc of 24 bytes will get 32 bytes)
 static const size_t kMinAlign   = 8;
 #else
-static const size_t kMinAlign   = 16;
+static const size_t kMinAlign   = 64;
 #endif
 
 // Using large pages speeds up the execution at a cost of larger memory use.