diff --git a/apps/graph/function.h b/apps/graph/function.h
index 8438d0a67..ecadd06e2 100644
--- a/apps/graph/function.h
+++ b/apps/graph/function.h
@@ -26,8 +26,6 @@ public:
   float evaluateAtAbscissa(float x, Context * context, Expression::AngleUnit angleUnit) const;
   float approximateDerivative(float x, Context * context, Expression::AngleUnit angleUnit) const;
 private:
-  constexpr static float k_epsilon = 0.0001f;
-  constexpr static float k_precision = 0.01f;
   constexpr static int k_bodyLength = 255;
   char m_text[k_bodyLength];
   const char * m_name;