diff --git a/src/ClpHelperFunctions.hpp b/src/ClpHelperFunctions.hpp
index 5afb68dc..4d6b7994 100644
--- a/src/ClpHelperFunctions.hpp
+++ b/src/ClpHelperFunctions.hpp
@@ -6,15 +6,7 @@
 #define ClpHelperFunctions_H
 
 #include "ClpConfig.h"
-#ifdef HAVE_CMATH
 #include <cmath>
-#else
-#ifdef HAVE_MATH_H
-#include <math.h>
-#else
-#error "don't have header file for math"
-#endif
-#endif
 
 /**
     Note (JJF) I have added some operations on arrays even though they may
diff --git a/src/CoinAbcHelperFunctions.hpp b/src/CoinAbcHelperFunctions.hpp
index 85e8f5bc..bffffd8e 100644
--- a/src/CoinAbcHelperFunctions.hpp
+++ b/src/CoinAbcHelperFunctions.hpp
@@ -6,15 +6,7 @@
 #define CoinAbcHelperFunctions_H
 
 #include "ClpConfig.h"
-#ifdef HAVE_CMATH
 #include <cmath>
-#else
-#ifdef HAVE_MATH_H
-#include <math.h>
-#else
-#include <cmath>
-#endif
-#endif
 #include "CoinAbcCommon.hpp"
 #ifndef abc_assert
 #define abc_assert(condition)                               \