diff --git a/source/dub/compilers/compiler.d b/source/dub/compilers/compiler.d
index 078fb0a..85aeb66 100644
--- a/source/dub/compilers/compiler.d
+++ b/source/dub/compilers/compiler.d
@@ -345,7 +345,7 @@
 {
 	assert(settings.targetName.length > 0, "No target name set.");
 	final switch(settings.targetType){
-		case TargetType.autodetect: assert(false);
+		case TargetType.autodetect: assert(false, "Configurations must have a concrete target type.");
 		case TargetType.none: return null;
 		case TargetType.sourceLibrary: return null;
 		case TargetType.executable:
diff --git a/source/dub/package_.d b/source/dub/package_.d
index d09ddf7..63548fd 100644
--- a/source/dub/package_.d
+++ b/source/dub/package_.d
@@ -128,7 +128,7 @@
 				}
 
 				BuildSettingsTemplate lib_settings;
-				lib_settings.targetType = m_info.buildSettings.targetType;
+				lib_settings.targetType = m_info.buildSettings.targetType == TargetType.autodetect ? TargetType.library : m_info.buildSettings.targetType;
 				lib_settings.excludedSourceFiles[""] = app_files;
 				m_info.configurations ~= ConfigurationInfo("library", lib_settings);
 			}