diff --git a/ROMFS/px4fmu_common/mixers/coax.main.mix b/ROMFS/px4fmu_common/mixers/coax.main.mix
index 96d9afdf1a..bcd161cc72 100644
--- a/ROMFS/px4fmu_common/mixers/coax.main.mix
+++ b/ROMFS/px4fmu_common/mixers/coax.main.mix
@@ -1,5 +1,5 @@
 Coaxial helicopter mixer
-- Two servomotors act on the swashplate (90° angle on the swashplate, decoupled effect on roll and pitch).
+- Two servomotors act on the swashplate (90 degree angle on the swashplate, decoupled effect on roll and pitch).
 - No collective pitch.
 - One motor per rotor.
 ===========================