diff --git a/gcc/testsuite/g++.dg/torture/pr104601.C b/gcc/testsuite/g++.dg/torture/pr104601.C
index bb56479c745..92ad73d47e9 100644
--- a/gcc/testsuite/g++.dg/torture/pr104601.C
+++ b/gcc/testsuite/g++.dg/torture/pr104601.C
@@ -4,6 +4,7 @@
 
 #include <algorithm>
 #include <optional>
+#include <vector>
 
 inline std::optional<int>
 foo (std::vector<int>::iterator b, std::vector<int>::iterator c,