diff --git a/samples/cpp/gencolors.cpp b/samples/cpp/gencolors.cpp
index b7cad8b2c7..e95d2a9550 100644
--- a/samples/cpp/gencolors.cpp
+++ b/samples/cpp/gencolors.cpp
@@ -4,6 +4,7 @@
 
 #include <cstdio>
 #include <iostream>
+#include <ctime>
 
 using namespace cv;
 using namespace std;