diff --git a/src/basic/alloc-util.c b/src/basic/alloc-util.c
index f4bd33f4e0..1e4ee722f2 100644
--- a/src/basic/alloc-util.c
+++ b/src/basic/alloc-util.c
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
+#include <malloc.h>
 #include <stdint.h>
 #include <string.h>
 
@@ -64,7 +65,7 @@ void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
                 return NULL;
 
         *p = q;
-        *allocated = newalloc;
+        *allocated = _unlikely_(size == 0) ? newalloc : malloc_usable_size(q) / size;
         return q;
 }