diff --git a/vibrator/cs40l26/Vibrator.cpp b/vibrator/cs40l26/Vibrator.cpp
index 06eba39..787700d 100644
--- a/vibrator/cs40l26/Vibrator.cpp
+++ b/vibrator/cs40l26/Vibrator.cpp
@@ -203,7 +203,6 @@ enum vibe_state {
     VIBE_STATE_ASP,
 };
 
-std::mutex mActiveId_mutex;  // protects mActiveId
 
 class DspMemChunk {
   private:
diff --git a/vibrator/cs40l26/Vibrator.h b/vibrator/cs40l26/Vibrator.h
index eab9461..b8e31de 100644
--- a/vibrator/cs40l26/Vibrator.h
+++ b/vibrator/cs40l26/Vibrator.h
@@ -256,6 +256,7 @@ class Vibrator : public BnVibrator {
     bool mConfigHapticAlsaDeviceDone{false};
     bool mGPIOStatus;
     bool mIsDual{false};
+    std::mutex mActiveId_mutex;  // protects mActiveId
 };
 
 }  // namespace vibrator