diff --git a/CMakeLists.txt b/CMakeLists.txt
index d0751f8..1baaa57 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -194,6 +194,7 @@ if(CONFIG_ZMK_JAVELIN_STENO)
       JAVELIN_USE_USER_DICTIONARY=1
       JAVELIN_PLATFORM_ZEPHYR=1
       JAVELIN_BOARD_CONFIG=<stddef.h>
+      _USE_MATH_DEFINES
     )
 
     target_sources(app PRIVATE