diff --git a/libraries/AP_Math/AP_Math.h b/libraries/AP_Math/AP_Math.h
index b0b0b92435..fcffbccc90 100644
--- a/libraries/AP_Math/AP_Math.h
+++ b/libraries/AP_Math/AP_Math.h
@@ -291,6 +291,4 @@ inline uint32_t usec_to_hz(uint32_t usec)
     return USEC_PER_SEC / usec;
 }
 
-#undef INLINE
 #endif // AP_MATH_H
-