diff --git a/patches/011-isisd-fix-typo.patch b/patches/011-isisd-fix-typo.patch
new file mode 100644
index 0000000..e7a1510
--- /dev/null
+++ b/patches/011-isisd-fix-typo.patch
@@ -0,0 +1,13 @@
+Index: quagga-0.99.21/isisd/isis_lsp.c
+===================================================================
+--- quagga-0.99.21.orig/isisd/isis_lsp.c
++++ quagga-0.99.21/isisd/isis_lsp.c
+@@ -2413,7 +2413,7 @@ top_lsp_refresh (struct thread *thread)
+   isis_dynhn_insert (lsp->lsp_header->lsp_id, lsp->tlv_data.hostname,
+ 		     IS_LEVEL_1);
+ 
+-  lsp->lsp_header->lsp_bits = lsp_bits_generate (level,
++  lsp->lsp_header->lsp_bits = lsp_bits_generate (lsp->level,
+                                                  lsp->area->overload_bit);
+   rem_lifetime = lsp_rem_lifetime (lsp->area, IS_LEVEL_1);
+   lsp->lsp_header->rem_lifetime = htons (rem_lifetime);