diff --git a/corelib/test/test_imumotionpredictor.cpp b/corelib/test/test_imumotionpredictor.cpp
index b60b42a6..48c61cc0 100644
--- a/corelib/test/test_imumotionpredictor.cpp
+++ b/corelib/test/test_imumotionpredictor.cpp
@@ -1,3 +1,7 @@
+// M_PI on MSVC (must come before any header including <cmath>)
+#ifndef _USE_MATH_DEFINES
+#define _USE_MATH_DEFINES
+#endif
 #include <gtest/gtest.h>
 
 #include <cmath>