1 files changed, 3 insertions, 4 deletions
diff --git a/src/components/heartrate/Ppg.h b/src/components/heartrate/Ppg.h
index 747ae019..ee07dfcf 100644
--- a/src/components/heartrate/Ppg.h
+++ b/src/components/heartrate/Ppg.h
@@ -10,22 +10,21 @@ namespace Pinetime {
     public:
       explicit Ppg(float spl);
 
-      int Preprocess(float spl);
+      int8_t Preprocess(float spl);
       float HeartRate();
 
       void SetOffset(uint16_t i);
       void Reset();
 
     private:
-      std::array<int, 200> data;
+      std::array<int8_t, 200> data;
       size_t dataIndex = 0;
       float offset;
       Biquad hpf;
       Ptagc agc;
       Biquad lpf;
 
-
       float ProcessHeartRate();
     };
   }
-}
-\ No newline at end of file
+}