diff --git a/include/mimalloc-types.h b/include/mimalloc-types.h
index cf94809b..a2c3fa9a 100644
--- a/include/mimalloc-types.h
+++ b/include/mimalloc-types.h
@@ -100,7 +100,7 @@ terms of the MIT license. A copy of the license can be found in the file
 // Main tuning parameters for segment and page sizes
 // Sizes for 64-bit, divide by two for 32-bit
 #define MI_SEGMENT_SLICE_SHIFT            (13 + MI_INTPTR_SHIFT)         // 64kb
-#define MI_SEGMENT_SHIFT                  ( 7 + MI_SEGMENT_SLICE_SHIFT)  // 8mb
+#define MI_SEGMENT_SHIFT                  ( 8 + MI_SEGMENT_SLICE_SHIFT)  // 8mb
 
 #define MI_SMALL_PAGE_SHIFT               (MI_SEGMENT_SLICE_SHIFT)       // 64kb
 #define MI_MEDIUM_PAGE_SHIFT              ( 3 + MI_SMALL_PAGE_SHIFT)     // 512kb