diff --git a/src/ca-module.cpp b/src/ca-module.cpp
index 9df8384..15f28e0 100644
--- a/src/ca-module.cpp
+++ b/src/ca-module.cpp
@@ -24,6 +24,7 @@
 #include <ndn-cxx/face.hpp>
 #include <ndn-cxx/security/verification-helpers.hpp>
 #include <ndn-cxx/security/signing-helpers.hpp>
+#include <ndn-cxx/util/random.hpp>
 
 namespace ndn {
 namespace ndncert {