diff --git a/samples/gpu/farneback_optical_flow.cpp b/samples/gpu/farneback_optical_flow.cpp
index 798b108a62..b3d67b6738 100644
--- a/samples/gpu/farneback_optical_flow.cpp
+++ b/samples/gpu/farneback_optical_flow.cpp
@@ -1,6 +1,7 @@
 #include <iostream>
 #include <vector>
 #include <sstream>
+#include <cmath>
 
 #include "opencv2/core.hpp"
 #include "opencv2/core/utility.hpp"