diff --git a/types.hpp b/types.hpp
index 61f3d68..e77dc8e 100644
--- a/types.hpp
+++ b/types.hpp
@@ -115,8 +115,8 @@
 using Type = uint8_t;
 using ReadingType = uint8_t;
 using Multiplier = uint16_t;
-using OffsetB = uint16_t;
-using Exponent = uint8_t;
+using OffsetB = int16_t;
+using Exponent = int8_t;
 using ScaledOffset = int64_t;
 using Scale = int16_t;
 using Unit = std::string;
@@ -154,6 +154,7 @@
    OffsetB coefficientB;
    Exponent exponentB;
    ScaledOffset scaledOffset;
+   Exponent exponentR;
    bool hasScale;
    Scale scale;
    Unit unit;