diff --git a/xt/cpp_comments.t b/xt/cpp_comments.t
index 040c083..8558de0 100644
--- a/xt/cpp_comments.t
+++ b/xt/cpp_comments.t
@@ -25,8 +25,8 @@ foreach my $file (@c_files) {
         $line++;
         if (/^(.*)\/\//) {
             my $m = $1;
-            if ($m !~ /\*/ && $m !~ /http:$/) { # skip the // in c++ comment in parse.c
-                fail("C++ comment in $file line $line");
+            if ($m !~ /\*/ && $m !~ /http:$/ && $m !~ m!"/*?$!) { # skip the // in c++ comment in parse.c
+                fail("C++ comment in $file line $line: $m");
                 next FILE;
             }
         }