diff --git a/test/testInteraction.cpp b/test/testInteraction.cpp
index e07c60a1c..0d64ae49d 100644
--- a/test/testInteraction.cpp
+++ b/test/testInteraction.cpp
@@ -16,6 +16,7 @@
 #include "gtest/gtest.h"
 
 #include <fstream>
+#include <vector>
 
 namespace crpropa {