diff --git a/src/libstrongswan/utils.c b/src/libstrongswan/utils.c
index 3a6a478ff..942f2ade0 100644
--- a/src/libstrongswan/utils.c
+++ b/src/libstrongswan/utils.c
@@ -24,6 +24,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <dirent.h>
+#include <time.h>
 
 #include <enum.h>
 #include <debug.h>