diff --git a/calculate_waste.py b/calculate_waste.py
index 4dd0de3..258d307 100755
--- a/calculate_waste.py
+++ b/calculate_waste.py
@@ -21,7 +21,7 @@ size_class_slots = [
     16, 16, 16, 16,
     8, 8, 8, 8,
     8, 8, 8, 8,
-    5, 6, 4, 4
+    6, 6, 4, 4
 ]
 
 print("size class", "worst case internal fragmentation", sep=", ")
diff --git a/malloc.c b/malloc.c
index 63de7e0..be89b31 100644
--- a/malloc.c
+++ b/malloc.c
@@ -158,7 +158,7 @@ static const uint16_t size_class_slots[] = {
     /* 256 */ 16, 16, 16, 16,
     /* 512 */ 8, 8, 8, 8,
     /* 1024 */ 8, 8, 8, 8,
-    /* 2048 */ 5, 6, 4, 4
+    /* 2048 */ 6, 6, 4, 4
 };
 
 #define N_SIZE_CLASSES (sizeof(size_classes) / sizeof(size_classes[0]))