1 files changed, 1 insertions, 5 deletions
diff --git a/tracker-rift-042/ftnoir_tracker_rift_042.cpp b/tracker-rift-042/ftnoir_tracker_rift_042.cpp
index 853dfcf9..749a927f 100644
--- a/tracker-rift-042/ftnoir_tracker_rift_042.cpp
+++ b/tracker-rift-042/ftnoir_tracker_rift_042.cpp
@@ -7,10 +7,6 @@
 #include <cstring>
 #include <cmath>
 
-#ifndef M_PI
-#   define M_PI 3.14159265358979323846
-#endif
-
 using namespace OVR;
 
 Rift_Tracker::Rift_Tracker() : old_yaw(0), hmd(nullptr)
@@ -66,7 +62,7 @@ void Rift_Tracker::data(double *data)
                     yaw_ += s.constant_drift;
                 old_yaw = yaw_;
             }
-            static constexpr double d2r = 180 / M_PI;
+            static constexpr double d2r = 180 / OPENTRACK_PI;
             data[Yaw] = yaw_ * -d2r;
             data[Pitch] = double(pitch) * d2r;
             data[Roll] = double(roll) * d2r;