diff --git a/src/drivers/pwm_out_sim/pwm_out_sim.cpp b/src/drivers/pwm_out_sim/pwm_out_sim.cpp
index 49f89d7817..3a711797fe 100644
--- a/src/drivers/pwm_out_sim/pwm_out_sim.cpp
+++ b/src/drivers/pwm_out_sim/pwm_out_sim.cpp
@@ -169,7 +169,7 @@ private:
 namespace
 {
 
-PWMSim	*g_pwm_sim;
+PWMSim	*g_pwm_sim = nullptr;
 
 } // namespace