diff --git a/src/tools/kdb/cmdline.cpp b/src/tools/kdb/cmdline.cpp
index b111366..96926a2 100644
--- a/src/tools/kdb/cmdline.cpp
+++ b/src/tools/kdb/cmdline.cpp
@@ -16,6 +16,7 @@
 
 #include <cstdio>
 #include <iostream>
+#include <limits>
 #include <set>
 #include <vector>