diff --git a/src/lib/platform/CMSWindowsHookLibraryLoader.cpp b/src/lib/platform/CMSWindowsHookLibraryLoader.cpp
index c6913955..54a3e84f 100644
--- a/src/lib/platform/CMSWindowsHookLibraryLoader.cpp
+++ b/src/lib/platform/CMSWindowsHookLibraryLoader.cpp
@@ -39,7 +39,7 @@ CMSWindowsHookLibraryLoader::openHookLibrary(const char* name)
 	// load the hook library
 	HINSTANCE hookLibrary = LoadLibrary(name);
 	if (hookLibrary == NULL) {
-		LOG((CLOG_ERR "failed to load hook library, %s.dll is missing", name));
+		LOG((CLOG_ERR "failed to load hook library, %s.dll is missing or invalid", name));
 		throw XScreenOpenFailure();
 	}