diff --git a/libc/include/errno.h b/libc/include/errno.h
index 13f70fb3..0d1c71e4 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -12,6 +12,7 @@
 #define EBADF 8
 #define EEXISTS 9
 #define ENOTEMPTY 10
+#define ENAMETOOLONG 11
 
 __BEGIN_DECLS
 
diff --git a/libc/string/strerror.cpp b/libc/string/strerror.cpp
index 76280287..bb6cc453 100644
--- a/libc/string/strerror.cpp
+++ b/libc/string/strerror.cpp
@@ -40,6 +40,9 @@ char* strerror(int error)
 	case ENOTEMPTY:
 		strcpy(buffer, "Directory not empty");
 		break;
+	case ENAMETOOLONG:
+		strcpy(buffer, "Filename too long");
+		break;
 	default:
 		{
 			// FIXME: sprintf