diff --git a/Kernel/API/POSIX/errno.h b/Kernel/API/POSIX/errno.h
index 65a8d74c1e..1b9235f5e9 100644
--- a/Kernel/API/POSIX/errno.h
+++ b/Kernel/API/POSIX/errno.h
@@ -88,6 +88,7 @@
     E(EDIRINTOSELF, "Cannot make directory a subdirectory of itself") \
     E(EDQUOT, "Quota exceeded")                                       \
     E(ENOTRECOVERABLE, "State not recoverable")                       \
+    E(ECANCELED, "Operation cancelled")                               \
     E(EMAXERRNO, "The highest errno +1 :^)")
 
 enum ErrnoCode {
diff --git a/Userland/Libraries/LibC/errno_codes.h b/Userland/Libraries/LibC/errno_codes.h
index f203c68911..cc9b75c7a4 100644
--- a/Userland/Libraries/LibC/errno_codes.h
+++ b/Userland/Libraries/LibC/errno_codes.h
@@ -88,6 +88,7 @@
 #define EDQUOT EDQUOT
 #define EDIRINTOSELF EDIRINTOSELF
 #define ENOTRECOVERABLE ENOTRECOVERABLE
+#define ECANCELED ECANCELED
 #define EMAXERRNO EMAXERRNO
 
 #define EWOULDBLOCK EAGAIN