diff --git a/lib/package_alternatives.c b/lib/package_alternatives.c
index ee792471..38edb2bf 100644
--- a/lib/package_alternatives.c
+++ b/lib/package_alternatives.c
@@ -98,7 +98,7 @@ relpath(char *from, char *to)
 
 	for (up = -1, from--; from && *from; from = strchr(from + 1, '/'), up++);
 
-	rel = calloc(1, 3 * up + strlen(p));
+	rel = calloc(3 * up + strlen(p), 1);
 	if (!rel)
 		return NULL;