diff --git a/frontends/src/tools/strings.py b/frontends/src/tools/strings.py
index 632b616d..280f13d0 100644
--- a/frontends/src/tools/strings.py
+++ b/frontends/src/tools/strings.py
@@ -84,7 +84,7 @@ def fixXHTMLLinks(xhtml):
     for match in re.finditer(r'<a( \w+="[^"]*")* ?/?>', xhtml):
         tag = match.group(0)
         url = re.search(r'href="([^"]*)"', tag)
-        if url:
+        if url and not url.group(1).startswith("#"):  # skip internal anchor
             if not re.search(r'target="([^"]*)"', tag):  # no target
                 subs.append((tag, '<a target="_blank"%s' % tag[2:]))
             if not re.match(r"^\w+://", url.group(1)):  # no scheme