diff --git a/include/libpsl.h b/include/libpsl.h
index 947360e..8bb4a74 100644
--- a/include/libpsl.h
+++ b/include/libpsl.h
@@ -32,6 +32,7 @@
 #define _LIBPSL_LIBPSL_H
 
 #include <stdio.h>
+#include <time.h>
 
 // Let C++ include C headers
 #ifdef  __cplusplus