diff --git a/source/dub/project.d b/source/dub/project.d
index 9f22601..2dd341b 100644
--- a/source/dub/project.d
+++ b/source/dub/project.d
@@ -252,8 +252,11 @@
 			dst.addVersions(["Have_" ~ stripDlangSpecialChars(pkg.name)]);
 
 			auto psettings = pkg.getBuildSettings(platform, configs[pkg.name]);
-			if (psettings.targetType != TargetType.none)
+			if (psettings.targetType != TargetType.none) {
 				processVars(dst, pkg.path.toNativeString(), 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, config);
+			}
 			if (pkg is m_main) {
 				enforce(psettings.targetType != TargetType.none, "Main package has target type \"none\" - stopping build.");
 				dst.targetType = psettings.targetType;