diff --git a/OndselSolver/FunctionXY.cpp b/OndselSolver/FunctionXY.cpp
index c001aaf..3c6865e 100644
--- a/OndselSolver/FunctionXY.cpp
+++ b/OndselSolver/FunctionXY.cpp
@@ -6,6 +6,7 @@
  *   See LICENSE file for details about copyright.                         *
  ***************************************************************************/
 
+#include <algorithm>
 #include "FunctionXY.h"
 #include "Sum.h"
 #include "Constant.h"
diff --git a/OndselSolver/Power.cpp b/OndselSolver/Power.cpp
index bd1d774..5b815d7 100644
--- a/OndselSolver/Power.cpp
+++ b/OndselSolver/Power.cpp
@@ -6,6 +6,7 @@
  *   See LICENSE file for details about copyright.                         *
  ***************************************************************************/
 
+#include <algorithm>
 #include "Power.h"
 #include "Constant.h"
 #include "Ln.h"