diff --git a/src/gui/about.cpp b/src/gui/about.cpp
index cd5888c61..4d1322a5a 100644
--- a/src/gui/about.cpp
+++ b/src/gui/about.cpp
@@ -17,7 +17,9 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#define _USE_MATH_DEFINES
 #include "gui.h"
+#include <math.h>
 
 const char* aboutLine[]={
   "tildearrow",
@@ -208,4 +210,4 @@ void FurnaceGUI::drawAbout() {
   }
   if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows)) curWindow=GUI_WINDOW_ABOUT;
   ImGui::End();
-}
\ No newline at end of file
+}
diff --git a/src/gui/actionUtil.h b/src/gui/actionUtil.h
index 38ed9a5cd..4e9196afc 100644
--- a/src/gui/actionUtil.h
+++ b/src/gui/actionUtil.h
@@ -5,7 +5,7 @@
       firstChannel=i; \
       break; \
     } \
-  } \
+  }
 
 #define DETERMINE_LAST \
   int lastChannel=0; \
@@ -18,4 +18,5 @@
 
 #define DETERMINE_FIRST_LAST \
   DETERMINE_FIRST \
-  DETERMINE_LAST
\ No newline at end of file
+  DETERMINE_LAST
+