diff --git a/include/mimalloc-types.h b/include/mimalloc-types.h
index 94188cc0..c0778f87 100644
--- a/include/mimalloc-types.h
+++ b/include/mimalloc-types.h
@@ -93,7 +93,7 @@ terms of the MIT license. A copy of the license can be found in the file
 
 #define MI_SMALL_OBJ_SIZE_MAX             (MI_SMALL_PAGE_SIZE/4)
 #define MI_MEDIUM_OBJ_SIZE_MAX            (MI_MEDIUM_PAGE_SIZE/4)   // 128kb on 64-bit
-#define MI_LARGE_OBJ_SIZE_MAX             (MI_LARGE_PAGE_SIZE/4)    // 1Mb on 64-bit
+#define MI_LARGE_OBJ_SIZE_MAX             (MI_LARGE_PAGE_SIZE/2)    // 2Mb on 64-bit
 #define MI_LARGE_OBJ_WSIZE_MAX            (MI_LARGE_OBJ_SIZE_MAX>>MI_INTPTR_SHIFT)
 #define MI_HUGE_OBJ_SIZE_MAX              (2*MI_INTPTR_SIZE*MI_SEGMENT_SIZE)  // (must match MI_REGION_MAX_ALLOC_SIZE in memory.c)