diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1baaa57..d6c5418 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -194,7 +194,7 @@ if(CONFIG_ZMK_JAVELIN_STENO)
       JAVELIN_USE_USER_DICTIONARY=1
       JAVELIN_PLATFORM_ZEPHYR=1
       JAVELIN_BOARD_CONFIG=<stddef.h>
-      _USE_MATH_DEFINES
+      M_PI=3.14159265358979323846
     )
 
     target_sources(app PRIVATE