diff --git a/btrfs-calc-size.c b/btrfs-calc-size.c
index 1ac7c785..d2d68ab2 100644
--- a/btrfs-calc-size.c
+++ b/btrfs-calc-size.c
@@ -19,6 +19,7 @@
 #include "volumes.h"
 #include "utils.h"
 #include "commands.h"
+#include "help.h"
 
 int main(int argc, char **argv)
 {