diff --git a/examples/llil4map.cc b/examples/llil4map.cc
index f3ef8f5..4e534c4 100644
--- a/examples/llil4map.cc
+++ b/examples/llil4map.cc
@@ -60,6 +60,7 @@
 #include <atomic>
 
 #include <iostream>
+#include <iomanip>
 #include <fstream>
 
 #include <parallel_hashmap/phmap.h>