1 files changed, 2 insertions, 0 deletions
diff --git a/cancel.c b/cancel.c
index e79ee08..28d2cbc 100644
--- a/cancel.c
+++ b/cancel.c
@@ -5,6 +5,8 @@
  * POSIX thread functions related to thread cancellation.
  */
 
+#include <errno.h>
+
 #include "pthread.h"
 #include "implement.h"