diff --git a/blueprint/pathtools/glob.go b/blueprint/pathtools/glob.go
index e6d43b3..bde4f4f 100644
--- a/blueprint/pathtools/glob.go
+++ b/blueprint/pathtools/glob.go
@@ -21,7 +21,8 @@ func Glob(pattern string) (matches, dirs []string, err error) {
 			dirElems := strings.Split(dir, string(filepath.Separator))
 
 			for _, index := range wildIndices {
-				dirs = append(dirs, filepath.Join(dirElems[:index]...))
+				dirs = append(dirs, strings.Join(dirElems[:index],
+					string(filepath.Separator)))
 			}
 		}
 	}