diff --git a/peaks/modulations/multistage_envelope.h b/peaks/modulations/multistage_envelope.h
index 5b1487a5..7ff894ad 100644
--- a/peaks/modulations/multistage_envelope.h
+++ b/peaks/modulations/multistage_envelope.h
@@ -293,9 +293,9 @@ class MultistageEnvelope {
   }
   
  private:
-  int16_t level_[kMaxNumSegments];
-  uint16_t time_[kMaxNumSegments];
-  EnvelopeShape shape_[kMaxNumSegments];
+  int16_t level_[kMaxNumSegments] = {};
+  uint16_t time_[kMaxNumSegments] = {};
+  EnvelopeShape shape_[kMaxNumSegments] = {};
   
   int16_t segment_;
   int16_t start_value_;