diff --git a/libc/include/errno.h b/libc/include/errno.h
index bdca7799a..815ccca3a 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -9,6 +9,7 @@
 #define ENOENT 5
 #define EIO 6
 #define ENOTSUP 7
+#define EBADF 8
 
 __BEGIN_DECLS
 
diff --git a/libc/string/strerror.cpp b/libc/string/strerror.cpp
index 6b337a8b5..893bb1b60 100644
--- a/libc/string/strerror.cpp
+++ b/libc/string/strerror.cpp
@@ -31,6 +31,9 @@ char* strerror(int error)
 	case ENOTSUP:
 		strcpy(buffer, "Operation not supported");
 		break;
+	case EBADF:
+		strcpy(buffer, "Bad file descriptor");
+		break;
 	default:
 		{
 			// FIXME: sprintf