diff --git a/thin-provisioning/thin_trim.cc b/thin-provisioning/thin_trim.cc
index ae57092..0118b62 100644
--- a/thin-provisioning/thin_trim.cc
+++ b/thin-provisioning/thin_trim.cc
@@ -2,6 +2,7 @@
 #include <getopt.h>
 #include <sys/ioctl.h>
 #include <linux/fs.h>
+#include <libgen.h>
 
 #undef BLOCK_SIZE