diff --git a/source/dub/package_.d b/source/dub/package_.d
index dfc225b..a4917d1 100644
--- a/source/dub/package_.d
+++ b/source/dub/package_.d
@@ -119,7 +119,7 @@
 				lib_settings.targetType = m_info.buildSettings.targetType == TargetType.autodetect ? TargetType.library : m_info.buildSettings.targetType;
 
 				if (m_info.buildSettings.targetType == TargetType.autodetect) {
-					if (app_main_file.length) {
+					if (app_main_file.length && lib_main_file != app_main_file) {
 						lib_settings.excludedSourceFiles[""] ~= app_main_file;
 
 						BuildSettingsTemplate app_settings;