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-rw-r--r--mavlink/include/mavlink/v1.0/mavlink_conversions.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/mavlink/include/mavlink/v1.0/mavlink_conversions.h b/mavlink/include/mavlink/v1.0/mavlink_conversions.h
index 1dc9088b7..d89363577 100644
--- a/mavlink/include/mavlink/v1.0/mavlink_conversions.h
+++ b/mavlink/include/mavlink/v1.0/mavlink_conversions.h
@@ -1,6 +1,12 @@
#ifndef _MAVLINK_CONVERSIONS_H_
#define _MAVLINK_CONVERSIONS_H_
+/* enable math defines on Windows */
+#ifdef _MSC_VER
+#ifndef _USE_MATH_DEFINES
+#define _USE_MATH_DEFINES
+#endif
+#endif
#include <math.h>
/**