diff --git a/src/lib/util/signal_set.cc b/src/lib/util/signal_set.cc
index 544d1d3fa3..c5f554a147 100644
--- a/src/lib/util/signal_set.cc
+++ b/src/lib/util/signal_set.cc
@@ -10,6 +10,7 @@
 
 #include <array>
 #include <cerrno>
+#include <cstring>
 #include <list>
 
 using namespace isc;