diff --git a/compat/mimalloc/alloc.c b/compat/mimalloc/alloc.c
index 1d1dfda94a..027421abf6 100644
--- a/compat/mimalloc/alloc.c
+++ b/compat/mimalloc/alloc.c
@@ -16,10 +16,6 @@ terms of the MIT license. A copy of the license can be found in the file
 #include <string.h>  // memset, strlen
 #include <stdlib.h>  // malloc, exit
 
-#define MI_IN_ALLOC_C
-#include "alloc-override.c"
-#undef MI_IN_ALLOC_C
-
 // ------------------------------------------------------
 // Allocation
 // ------------------------------------------------------
diff --git a/compat/mimalloc/mimalloc.h b/compat/mimalloc/mimalloc.h
index 2646cfa066..d4e96cba4f 100644
--- a/compat/mimalloc/mimalloc.h
+++ b/compat/mimalloc/mimalloc.h
@@ -95,7 +95,8 @@ terms of the MIT license. A copy of the license can be found in the file
 // Includes
 // ------------------------------------------------------
 
-#include <stddef.h>     // size_t
+#include "git-compat-util.h"
+
 #include <stdbool.h>    // bool
 #include <stdint.h>     // INTPTR_MAX