diff --git a/source/dub/dub.d b/source/dub/dub.d
index 683996f..dc3d038 100644
--- a/source/dub/dub.d
+++ b/source/dub/dub.d
@@ -666,7 +666,7 @@
 					NativePath msf = NativePath(mainfil);
 					if (msf.absolute)
 						msf = msf.relativeTo(m_project.rootPackage.path);
-					if (NativePath(file).relativeTo(m_project.rootPackage.path) == msf) {
+					if (!settings.single && NativePath(file).relativeTo(m_project.rootPackage.path) == msf) {
 						logWarn("Excluding main source file %s from test.", mainfil);
 						tcinfo.excludedSourceFiles[""] ~= mainfil;
 						continue;