diff --git a/can-calc-bit-timing.c b/can-calc-bit-timing.c
index 46803f2..e3bee9f 100644
--- a/can-calc-bit-timing.c
+++ b/can-calc-bit-timing.c
@@ -23,6 +23,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <libgen.h>
 #include <string.h>
 
 #include <linux/types.h>
diff --git a/slcanpty.c b/slcanpty.c
index 611af10..fc72dfe 100644
--- a/slcanpty.c
+++ b/slcanpty.c
@@ -26,6 +26,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <libgen.h>
 #include <string.h>
 #include <unistd.h>
 #include <fcntl.h>