diff --git a/libs/libdsp/lib_motor.c b/libs/libdsp/lib_motor.c
index 7998a1ec9ed..21c835da820 100644
--- a/libs/libdsp/lib_motor.c
+++ b/libs/libdsp/lib_motor.c
@@ -390,7 +390,7 @@ void motor_phy_params_init(FAR struct motor_phy_params_s *phy, uint8_t poles,
   DEBUGASSERT(phy != NULL);
 
   phy->p          = poles;
-  phy->res_base   = res_base;
+  phy->res_base   = res;
   phy->ind        = ind;
   phy->one_by_ind = 1.0f/ind;