5 files changed, 16 insertions, 12 deletions
diff --git a/src/tools/linkchecker/Cargo.toml b/src/tools/linkchecker/Cargo.toml
index fb5bff3fe63..f0886e31b24 100644
--- a/src/tools/linkchecker/Cargo.toml
+++ b/src/tools/linkchecker/Cargo.toml
@@ -10,3 +10,4 @@ path = "main.rs"
 [dependencies]
 regex = "1"
 html5ever = "0.29.0"
+urlencoding = "2.1.3"
diff --git a/src/tools/linkchecker/main.rs b/src/tools/linkchecker/main.rs
index 1dc45728c90..e07a0784cdb 100644
--- a/src/tools/linkchecker/main.rs
+++ b/src/tools/linkchecker/main.rs
@@ -232,18 +232,7 @@ enum FileEntry {
 type Cache = HashMap<String, FileEntry>;
 
 fn small_url_encode(s: &str) -> String {
-    s.replace('<', "%3C")
-        .replace('>', "%3E")
-        .replace(' ', "%20")
-        .replace('?', "%3F")
-        .replace('\'', "%27")
-        .replace('&', "%26")
-        .replace(',', "%2C")
-        .replace(':', "%3A")
-        .replace(';', "%3B")
-        .replace('[', "%5B")
-        .replace(']', "%5D")
-        .replace('\"', "%22")
+    urlencoding::encode(s).to_string()
 }
 
 impl Checker {
diff --git a/src/tools/linkchecker/tests/valid/inner/bar.html b/src/tools/linkchecker/tests/valid/inner/bar.html
index 4b500d78b76..6ffda259c40 100644
--- a/src/tools/linkchecker/tests/valid/inner/bar.html
+++ b/src/tools/linkchecker/tests/valid/inner/bar.html
@@ -3,5 +3,8 @@
 
   <h2 id="barfrag">Bar</h2>
 
+  <!-- testing urlecoded anchor link against a non-urlencoded heading IDs -->
+  <h2 id="barfrag-è">Bar</h2>
+
 </body>
 </html>
diff --git a/src/tools/linkchecker/tests/valid/inner/foo.html b/src/tools/linkchecker/tests/valid/inner/foo.html
index 3c6a7483bcd..f30bf718205 100644
--- a/src/tools/linkchecker/tests/valid/inner/foo.html
+++ b/src/tools/linkchecker/tests/valid/inner/foo.html
@@ -8,7 +8,15 @@
   <a href="https://example.com/doesnotexist">external links not validated</a>
   <a href="redir.html#redirfrag">Redirect</a>
 
+  <!-- testing urlecoded anchor link against a non-urlencoded heading IDs -->
+  <a href="#localfrag-%C3%A8"></a>
+  <a href="bar.html#barfrag-%C3%A8"></a>
+  <a href="redir.html#redirfrag-%C3%A8"></a>
+
   <h2 id="localfrag">Local</h2>
 
+  <!-- testing urlecoded anchor link against a non-urlencoded heading IDs -->
+  <h2 id="localfrag-è">Local</h2>
+
 </body>
 </html>
diff --git a/src/tools/linkchecker/tests/valid/inner/redir-target.html b/src/tools/linkchecker/tests/valid/inner/redir-target.html
index bd59884a01e..ac1dec6d5b4 100644
--- a/src/tools/linkchecker/tests/valid/inner/redir-target.html
+++ b/src/tools/linkchecker/tests/valid/inner/redir-target.html
@@ -1,5 +1,8 @@
 <html>
 <body>
   <h2 id="redirfrag">Redir</h2>
+
+  <!-- testing urlecoded anchor link against a non-urlencoded heading IDs -->
+  <h2 id="redirfrag-è">Redir</h2>
 </body>
 </html>