diff --git a/proto.h b/proto.h
index 1753f61..d54b0b1 100644
--- a/proto.h
+++ b/proto.h
@@ -408,8 +408,8 @@ int flist_ndx_pop(flist_ndx_list *lp);
 void *expand_item_list(item_list *lp, size_t item_size,
 		       const char *desc, int incr);
 int msleep(int t);
-void *_new_array(unsigned long num, unsigned int size, int use_calloc);
-void *_realloc_array(void *ptr, unsigned int size, size_t num);
+void *_new_array(size_t num, size_t size, int use_calloc);
+void *_realloc_array(void *ptr, size_t size, size_t num);
 const char *sum_as_hex(int csum_type, const char *sum, int flist_csum);
 NORETURN void out_of_memory(const char *str);
 NORETURN void overflow_exit(const char *str);
diff --git a/util2.c b/util2.c
index 2722ab3..21c3e27 100644
--- a/util2.c
+++ b/util2.c
@@ -59,19 +59,13 @@ int msleep(int t)
 	return True;
 }
 
-#define MALLOC_MAX 0x40000000
-
-void *_new_array(unsigned long num, unsigned int size, int use_calloc)
+void *_new_array(size_t num, size_t size, int use_calloc)
 {
-	if (num >= MALLOC_MAX/size)
-		return NULL;
 	return use_calloc ? calloc(num, size) : malloc(num * size);
 }
 
-void *_realloc_array(void *ptr, unsigned int size, size_t num)
+void *_realloc_array(void *ptr, size_t size, size_t num)
 {
-	if (num >= MALLOC_MAX/size)
-		return NULL;
 	if (!ptr)
 		return malloc(size * num);
 	return realloc(ptr, size * num);