diff --git a/include/errno.h b/include/errno.h
index 92730a8f..4d3bfe47 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -27,7 +27,6 @@ extern "C" {
 
 /* Linux/x86-compatible numbers for easier debugging */
 
-#define EDEADLK         38
 #define ENOTEMPTY       39
 #define ELOOP           40
 #define ENOMSG          42