diff --git a/src/olympic/studio/modlib/src/project.cpp b/src/olympic/studio/modlib/src/project.cpp
index 609c1d12..dbf34dbb 100644
--- a/src/olympic/studio/modlib/src/project.cpp
+++ b/src/olympic/studio/modlib/src/project.cpp
@@ -48,7 +48,10 @@ static ox::Result<ox::Vector<ox::String>> listAllRecursive(ox::FileSystem &fs, o
 
 [[nodiscard]]
 static constexpr bool isParentOf(ox::StringViewCR parent, ox::StringViewCR child) noexcept {
-	return beginsWith(child, parent);
+	if (endsWith(child, "/")) {
+		return beginsWith(child, parent);
+	}
+	return beginsWith(sfmt("{}/", child), parent);
 }
 
 Project::Project(keel::Context &ctx, ox::String path, ox::StringViewCR projectDataDir):