diff --git a/data/tools/wmllint b/data/tools/wmllint
index 915e74033db..f4a8a3f7800 100755
--- a/data/tools/wmllint
+++ b/data/tools/wmllint
@@ -1594,6 +1594,10 @@ def global_sanity_check(filename, lines):
                             if ids[j].lstrip() not in present and not in_clear_menu_item:
                                 print '"%s", line %d: unknown \'%s\' referred to by id' \
                                     % (filename, i+1, ids[j])
+                if (in_scenario or in_multiplayer) and key == "speaker":
+                    if value not in present and value not in ("narrator", "unit", "second_unit") and value[0] not in ("$", "{"):
+                        print '"%s", line %d: unknown speaker \'%s\' in message' \
+                              % (filename, i+1, value)
                 if markcheck and has_tr_mark and not ("wmllint: ignore" in comment or "wmllint: noconvert" in comment):
                     print '"%s", line %d: %s should not have a translation mark' \
                               % (filename, i+1, key)