diff --git a/lib/util.cpp b/lib/util.cpp
index 012ea106..e488e4aa 100644
--- a/lib/util.cpp
+++ b/lib/util.cpp
@@ -20,6 +20,7 @@
 #endif
 #include <stdlib.h>
 #include <sys/resource.h>
+#include <fstream>
 
 #define RAXHDR_FIELDOFFSET p[1]
 #define RAX_REQDFIELDS_LEN 36