diff --git a/source/dub/internal/vibecompat/inet/path.d b/source/dub/internal/vibecompat/inet/path.d
index 6b54292..15d9fbe 100644
--- a/source/dub/internal/vibecompat/inet/path.d
+++ b/source/dub/internal/vibecompat/inet/path.d
@@ -163,7 +163,9 @@
 		while( parentPath.length > nup && !startsWith(parentPath[0 .. parentPath.length-nup]) ){
 			nup++;
 		}
+		assert(m_nodes.length >= parentPath.length - nup);
 		Path ret = Path(null, false);
+		assert(m_nodes.length >= parentPath.length - nup);
 		ret.m_endsWithSlash = true;
 		foreach( i; 0 .. nup ) ret ~= "..";
 		ret ~= Path(m_nodes[parentPath.length-nup .. $], false);
@@ -457,3 +459,18 @@
 		}
 	}
 }
+
+unittest {
+	assert(Path("/foo/bar/baz").relativeTo(Path("/foo")).toString == "bar/baz");
+	assert(Path("/foo/bar/baz/").relativeTo(Path("/foo")).toString == "bar/baz/");
+	assert(Path("/foo/bar").relativeTo(Path("/foo")).toString == "bar");
+	assert(Path("/foo/bar/").relativeTo(Path("/foo")).toString == "bar/");
+	assert(Path("/foo").relativeTo(Path("/foo/bar")).toString() == "..");
+	assert(Path("/foo/").relativeTo(Path("/foo/bar")).toString() == "../");
+	assert(Path("/foo/baz").relativeTo(Path("/foo/bar/baz")).toString() == "../../baz");
+	assert(Path("/foo/baz/").relativeTo(Path("/foo/bar/baz")).toString() == "../../baz/");
+	assert(Path("/foo/").relativeTo(Path("/foo/bar/baz")).toString() == "../../");
+	assert(Path("/foo/").relativeTo(Path("/foo/bar/baz/mumpitz")).toString() == "../../../");
+	assert(Path("/foo").relativeTo(Path("/foo")).toString() == "");
+	assert(Path("/foo/").relativeTo(Path("/foo")).toString() == "");
+}