diff --git a/src/tl/unit_tests/tlVariantTests.cc b/src/tl/unit_tests/tlVariantTests.cc
index 7fb6efc72..b73534887 100644
--- a/src/tl/unit_tests/tlVariantTests.cc
+++ b/src/tl/unit_tests/tlVariantTests.cc
@@ -27,6 +27,8 @@
 #include "tlObject.h"
 #include "tlTypeTraits.h"
 #include "tlUnitTest.h"
+
+#include <cmath>
 #include <cstdio>
 #include <memory>