diff --git a/libraries/AP_HAL_Linux/PWM_Sysfs.h b/libraries/AP_HAL_Linux/PWM_Sysfs.h
index be7a9abb3a..b3c6bb22fe 100644
--- a/libraries/AP_HAL_Linux/PWM_Sysfs.h
+++ b/libraries/AP_HAL_Linux/PWM_Sysfs.h
@@ -7,7 +7,7 @@
 
 class Linux::PWM_Sysfs_Base {
 public:
-    ~PWM_Sysfs_Base();
+    virtual ~PWM_Sysfs_Base();
 
     enum Polarity {
         NORMAL = 0,