diff --git a/src/analyses/libraryFunctions.ml b/src/analyses/libraryFunctions.ml
index 7bc373e3cc..62dbe2aa7c 100644
--- a/src/analyses/libraryFunctions.ml
+++ b/src/analyses/libraryFunctions.ml
@@ -551,7 +551,8 @@ let gcc_descs_list: (string * LibraryDesc.t) list = LibraryDsl.[
 let glibc_desc_list: (string * LibraryDesc.t) list = LibraryDsl.[
     ("fputs_unlocked", unknown [drop "s" [r]; drop "stream" [w]]);
     ("futimesat", unknown [drop "dirfd" []; drop "pathname" [r]; drop "times" [r]]);
-    ("error", unknown ((drop "status" []):: (drop "errnum" []) :: (drop "format" [r]) :: (VarArgs (drop' [r]))));
+    ("error", unknown ((drop "status" []) :: (drop "errnum" []) :: (drop "format" [r]) :: (VarArgs (drop' [r]))));
+    ("warn", unknown (drop "format" [r] :: VarArgs (drop' [r])));
     ("gettext", unknown [drop "msgid" [r]]);
     ("euidaccess", unknown [drop "pathname" [r]; drop "mode" []]);
     ("rpmatch", unknown [drop "response" [r]]);