diff --git a/dlib/rand/rand_kernel_1.h b/dlib/rand/rand_kernel_1.h
index 3e0067681..835402526 100644
--- a/dlib/rand/rand_kernel_1.h
+++ b/dlib/rand/rand_kernel_1.h
@@ -5,6 +5,7 @@
 
 #include <string>
 #include <complex>
+#include <random>
 #include "../algs.h"
 #include "rand_kernel_abstract.h"
 #include "mersenne_twister.h"