diff --git a/object-file.c b/object-file.c
index c3e20417f3..a7868201d0 100644
--- a/object-file.c
+++ b/object-file.c
@@ -718,54 +718,6 @@ int has_loose_object(const struct object_id *oid)
 	return check_and_freshen(oid, 0);
 }
 
-static void mmap_limit_check(size_t length)
-{
-	static size_t limit = 0;
-	if (!limit) {
-		limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
-		if (!limit)
-			limit = SIZE_MAX;
-	}
-	if (length > limit)
-		die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
-		    (uintmax_t)length, (uintmax_t)limit);
-}
-
-void *xmmap_gently(void *start, size_t length,
-		  int prot, int flags, int fd, off_t offset)
-{
-	void *ret;
-
-	mmap_limit_check(length);
-	ret = mmap(start, length, prot, flags, fd, offset);
-	if (ret == MAP_FAILED && !length)
-		ret = NULL;
-	return ret;
-}
-
-const char *mmap_os_err(void)
-{
-	static const char blank[] = "";
-#if defined(__linux__)
-	if (errno == ENOMEM) {
-		/* this continues an existing error message: */
-		static const char enomem[] =
-", check sys.vm.max_map_count and/or RLIMIT_DATA";
-		return enomem;
-	}
-#endif /* OS-specific bits */
-	return blank;
-}
-
-void *xmmap(void *start, size_t length,
-	int prot, int flags, int fd, off_t offset)
-{
-	void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
-	if (ret == MAP_FAILED)
-		die_errno(_("mmap failed%s"), mmap_os_err());
-	return ret;
-}
-
 static int format_object_header_literally(char *str, size_t size,
 					  const char *type, size_t objsize)
 {
diff --git a/wrapper.c b/wrapper.c
index 8b98593149..3c79778055 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -829,3 +829,51 @@ uint32_t git_rand(unsigned flags)
 
 	return result;
 }
+
+static void mmap_limit_check(size_t length)
+{
+	static size_t limit = 0;
+	if (!limit) {
+		limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
+		if (!limit)
+			limit = SIZE_MAX;
+	}
+	if (length > limit)
+		die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
+		    (uintmax_t)length, (uintmax_t)limit);
+}
+
+void *xmmap_gently(void *start, size_t length,
+		  int prot, int flags, int fd, off_t offset)
+{
+	void *ret;
+
+	mmap_limit_check(length);
+	ret = mmap(start, length, prot, flags, fd, offset);
+	if (ret == MAP_FAILED && !length)
+		ret = NULL;
+	return ret;
+}
+
+const char *mmap_os_err(void)
+{
+	static const char blank[] = "";
+#if defined(__linux__)
+	if (errno == ENOMEM) {
+		/* this continues an existing error message: */
+		static const char enomem[] =
+", check sys.vm.max_map_count and/or RLIMIT_DATA";
+		return enomem;
+	}
+#endif /* OS-specific bits */
+	return blank;
+}
+
+void *xmmap(void *start, size_t length,
+	int prot, int flags, int fd, off_t offset)
+{
+	void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
+	if (ret == MAP_FAILED)
+		die_errno(_("mmap failed%s"), mmap_os_err());
+	return ret;
+}