diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 0119aa642c..607606f4c7 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -472,7 +472,7 @@ AudioEngine::discover_backends ()
 
 	Glib::PatternSpec so_extension_pattern("*backend.so");
 	Glib::PatternSpec dylib_extension_pattern("*backend.dylib");
-	Glib::PatternSpec dll_extension_pattern("*backend.dll");
+	Glib::PatternSpec dll_extension_pattern("*backend*.dll");
 
 	find_matching_files_in_search_path (backend_search_path (),
 	                                    so_extension_pattern, backend_modules);