diff --git a/test-suite/quantlibtestsuite.cpp b/test-suite/quantlibtestsuite.cpp
index 18ff8baaa80..b21ac6d7a4c 100644
--- a/test-suite/quantlibtestsuite.cpp
+++ b/test-suite/quantlibtestsuite.cpp
@@ -18,6 +18,8 @@
  FOR A PARTICULAR PURPOSE.  See the license for more details.
 */
 
+#include <ql/qldefines.hpp>
+
 #define BOOST_TEST_MODULE QuantLibTests
 
 #ifdef QL_ENABLE_PARALLEL_UNIT_TEST_RUNNER