diff --git a/source/dub/project.d b/source/dub/project.d
index bba506a..1ef1610 100644
--- a/source/dub/project.d
+++ b/source/dub/project.d
@@ -389,8 +389,8 @@
 				processVars(dst, pkg_path, psettings);
 				if (psettings.importPaths.empty)
 					logWarn(`Package %s (configuration "%s") defines no import paths, use {"importPaths": [...]} or the default package directory structure to fix this.`, pkg.name, configs[pkg.name]);
-				if (psettings.mainSourceFile.empty && pkg is m_main)
-					logWarn(`Package %s (configuration "%s") defines no main source file, this may cause certain build modes to fail. Add an explicit "mainSourceFile" to the package description to fix this.`, pkg.name, configs[pkg.name]);
+				if (psettings.mainSourceFile.empty && pkg is m_main && psettings.targetType == TargetType.executable)
+					logWarn(`Executable configuration "%s" of package %s defines no main source file, this may cause certain build modes to fail. Add an explicit "mainSourceFile" to the package description to fix this.`, configs[pkg.name], pkg.name);
 			}
 			if (pkg is m_main) {
 				if (!shallow) {