diff --git a/src/system/libroot/posix/dirent.c b/src/system/libroot/posix/dirent.c
index 5db1f26275..b827ec134d 100644
--- a/src/system/libroot/posix/dirent.c
+++ b/src/system/libroot/posix/dirent.c
@@ -123,7 +123,10 @@ opendir(const char* path)
 
 	int fd = _kern_open_dir(-1, path);
 	if (fd < 0) {
-		errno = fd;
+		if (fd == B_BAD_VALUE)
+			errno = B_NOT_A_DIRECTORY;
+		else
+			errno = fd;
 		return NULL;
 	}