diff --git a/src/emucore/tia/PaddleReader.cxx b/src/emucore/tia/PaddleReader.cxx
index 69c828ea6..27ff82820 100644
--- a/src/emucore/tia/PaddleReader.cxx
+++ b/src/emucore/tia/PaddleReader.cxx
@@ -22,7 +22,6 @@
 static constexpr double
   C = 68e-9,
   RPOT = 1e6,
-  R0 = 1.5e3,
   USUPP = 5;
 
 static constexpr double TRIPPOINT_LINES = 379;
diff --git a/src/emucore/tia/PaddleReader.hxx b/src/emucore/tia/PaddleReader.hxx
index 00238a4fe..0032e6efd 100644
--- a/src/emucore/tia/PaddleReader.hxx
+++ b/src/emucore/tia/PaddleReader.hxx
@@ -65,6 +65,8 @@ class PaddleReader : public Serializable
 
     bool myIsDumped;
 
+    static constexpr double R0 = 1.5e3;
+
   private:
     PaddleReader(const PaddleReader&) = delete;
     PaddleReader(PaddleReader&&) = delete;