diff --git a/sw/airborne/arch/sim/subsystems/radio_control/ppm_arch.h b/sw/airborne/arch/sim/subsystems/radio_control/ppm_arch.h
index 38391391ab..7331cf6516 100644
--- a/sw/airborne/arch/sim/subsystems/radio_control/ppm_arch.h
+++ b/sw/airborne/arch/sim/subsystems/radio_control/ppm_arch.h
@@ -33,7 +33,7 @@
  */
 #define RC_PPM_TICKS_OF_USEC(_x) (_x)
 #define RC_PPM_SIGNED_TICKS_OF_USEC(_x) (_x)
-#define USEC_OF_RC_PPM_TICS(_x) (_x)
+#define USEC_OF_RC_PPM_TICKS(_x) (_x)
 
 #define PPM_NB_CHANNEL RADIO_CONTROL_NB_CHANNEL