diff --git a/fragment.c b/fragment.c
index d42321d..481b48f 100644
--- a/fragment.c
+++ b/fragment.c
@@ -66,11 +66,31 @@ pkg_fragment_add(pkg_fragment_t *head, const char *string)
 	return pkg_fragment_append(head, frag);
 }
 
+bool
+pkg_fragment_exists(pkg_fragment_t *head, pkg_fragment_t *base)
+{
+	pkg_fragment_t *node;
+
+	foreach_list_entry(head, node)
+	{
+		if (base->type != node->type)
+			continue;
+
+		if (!strcmp(base->data, node->data))
+			return true;
+	}
+
+	return false;
+}
+
 pkg_fragment_t *
 pkg_fragment_copy(pkg_fragment_t *head, pkg_fragment_t *base)
 {
 	pkg_fragment_t *frag;
 
+	if (pkg_fragment_exists(head, base))
+		return head;
+
 	frag = calloc(sizeof(pkg_fragment_t), 1);
 
 	frag->type = base->type;
diff --git a/pkg.h b/pkg.h
index 8787a91..2cca40c 100644
--- a/pkg.h
+++ b/pkg.h
@@ -138,5 +138,6 @@ pkg_fragment_t *pkg_fragment_append(pkg_fragment_t *head, pkg_fragment_t *tail);
 pkg_fragment_t *pkg_fragment_add(pkg_fragment_t *head, const char *string);
 pkg_fragment_t *pkg_fragment_copy(pkg_fragment_t *head, pkg_fragment_t *base);
 void pkg_fragment_delete(pkg_fragment_t *node);
+bool pkg_fragment_exists(pkg_fragment_t *head, pkg_fragment_t *base);
 
 #endif