diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 71dd6123..1d64ec50 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -1,3 +1,4 @@
+#define _USE_MATH_DEFINES
 #include "engine.h"
 #include "instrument.h"
 #include "safeReader.h"
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index ec410d65..40559370 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -1,3 +1,4 @@
+#define _USE_MATH_DEFINES
 #include "dispatch.h"
 #include "engine.h"
 #include "../ta-log.h"
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 49b8895c..f08ba6ad 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1,3 +1,4 @@
+#define _USE_MATH_DEFINES
 #include "gui.h"
 #include "SDL_clipboard.h"
 #include "SDL_events.h"