diff --git a/src/gui/editControls.cpp b/src/gui/editControls.cpp
index b10c85ea..f019f766 100644
--- a/src/gui/editControls.cpp
+++ b/src/gui/editControls.cpp
@@ -17,6 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#define _USE_MATH_DEFINES
 #include "gui.h"
 #include "IconsFontAwesome4.h"
 #include <fmt/printf.h>
diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index 7e48b246..8eb841c7 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -17,6 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#define _USE_MATH_DEFINES
 #include "gui.h"
 #include "imgui_internal.h"
 #include "../engine/macroInt.h"
diff --git a/src/gui/pattern.cpp b/src/gui/pattern.cpp
index 2c611d46..d14902ee 100644
--- a/src/gui/pattern.cpp
+++ b/src/gui/pattern.cpp
@@ -18,7 +18,6 @@
  */
 
 // for suck's fake Clang extension!
-#include <imgui.h>
 #define _USE_MATH_DEFINES
 #include "gui.h"
 #include "../ta-log.h"
diff --git a/src/gui/sampleEdit.cpp b/src/gui/sampleEdit.cpp
index beca3102..2f80a04f 100644
--- a/src/gui/sampleEdit.cpp
+++ b/src/gui/sampleEdit.cpp
@@ -16,6 +16,8 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
+
+#define _USE_MATH_DEFINES
 #include "gui.h"
 #include <imgui.h>
 #include <imgui_internal.h>