diff --git a/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.cs b/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.cs
index 1757cf2afd..fe3d2575ce 100644
--- a/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.cs
+++ b/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.cs
@@ -1,3 +1,5 @@
+ /**/
+// the previous comment is an empty delimited comment and not a document comment
 class Foo { /// class X
  /* aaa
 
diff --git a/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.txt b/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.txt
index 92214cb4e9..0134960679 100644
--- a/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.txt
+++ b/pmd-cs/src/test/resources/net/sourceforge/pmd/lang/cs/cpd/testdata/comments.txt
@@ -1,8 +1,8 @@
     [Image] or [Truncated image[            Bcol      Ecol
-L1
+L3
     [class]                                 1         5
     [Foo]                                   7         9
     [{]                                     11        11
-L6
+L8
     [}]                                     2         2
 EOF