diff --git a/lib/libalpm/delta.c b/lib/libalpm/delta.c
index fed84f45..fc7a0f75 100644
--- a/lib/libalpm/delta.c
+++ b/lib/libalpm/delta.c
@@ -314,11 +314,25 @@ pmdelta_t *_alpm_delta_parse(char *line)
 
 void _alpm_delta_free(pmdelta_t *delta)
 {
-	FREE(delta->from);
-	FREE(delta->to);
 	FREE(delta->delta);
 	FREE(delta->delta_md5);
+	FREE(delta->from);
+	FREE(delta->to);
 	FREE(delta);
 }
 
+pmdelta_t *_alpm_delta_dup(const pmdelta_t *delta)
+{
+	pmdelta_t *newdelta;
+	CALLOC(newdelta, 1, sizeof(pmdelta_t), return NULL);
+	STRDUP(newdelta->delta, delta->delta, return NULL);
+	STRDUP(newdelta->delta_md5, delta->delta_md5, return NULL);
+	STRDUP(newdelta->from, delta->from, return NULL);
+	STRDUP(newdelta->to, delta->to, return NULL);
+	newdelta->delta_size = delta->delta_size;
+	newdelta->download_size = delta->download_size;
+
+	return newdelta;
+}
+
 /* vim: set ts=2 sw=2 noet: */
diff --git a/lib/libalpm/delta.h b/lib/libalpm/delta.h
index 87869256..6ac54139 100644
--- a/lib/libalpm/delta.h
+++ b/lib/libalpm/delta.h
@@ -28,6 +28,7 @@
 
 pmdelta_t *_alpm_delta_parse(char *line);
 void _alpm_delta_free(pmdelta_t *delta);
+pmdelta_t *_alpm_delta_dup(const pmdelta_t *delta);
 off_t _alpm_shortest_delta_path(pmhandle_t *handle, alpm_list_t *deltas,
 		const char *to, alpm_list_t **path);
 
diff --git a/lib/libalpm/package.c b/lib/libalpm/package.c
index ff011982..0b0e9741 100644
--- a/lib/libalpm/package.c
+++ b/lib/libalpm/package.c
@@ -466,7 +466,9 @@ pmpkg_t *_alpm_pkg_dup(pmpkg_t *pkg)
 	newpkg->optdepends = alpm_list_strdup(pkg->optdepends);
 	newpkg->conflicts  = alpm_list_strdup(pkg->conflicts);
 	newpkg->provides   = alpm_list_strdup(pkg->provides);
-	newpkg->deltas     = alpm_list_copy_data(pkg->deltas, sizeof(pmdelta_t));
+	for(i = pkg->deltas; i; i = alpm_list_next(i)) {
+		newpkg->deltas = alpm_list_add(newpkg->deltas, _alpm_delta_dup(i->data));
+	}
 
 	/* internal */
 	newpkg->infolevel = pkg->infolevel;