diff --git a/tests/issues.cpp b/tests/issues.cpp
index 1ff483f..f929099 100644
--- a/tests/issues.cpp
+++ b/tests/issues.cpp
@@ -3,6 +3,7 @@
 
 #include <string>
 #include <memory>
+#include <system_error>
 
 using std::string;