diff --git a/packages/remark-wiki-link/src/lib/fromMarkdown.ts b/packages/remark-wiki-link/src/lib/fromMarkdown.ts
index d9e9a0ef..5b5f7b9c 100644
--- a/packages/remark-wiki-link/src/lib/fromMarkdown.ts
+++ b/packages/remark-wiki-link/src/lib/fromMarkdown.ts
@@ -116,7 +116,7 @@ function fromMarkdown(opts: FromMarkdownOptions = {}) {
 
     // remove leading # if the target is a heading on the same page
     const displayName = alias || target.replace(/^#/, "");
-    const headingId = heading.replace(/\s+/, "-").toLowerCase();
+    const headingId = heading.replace(/\s+/g, "-").toLowerCase();
     let classNames = wikiLinkClassName;
     if (!matchingPermalink) {
       classNames += " " + newClassName;
diff --git a/packages/remark-wiki-link/src/lib/html.ts b/packages/remark-wiki-link/src/lib/html.ts
index 021970a8..1058652f 100644
--- a/packages/remark-wiki-link/src/lib/html.ts
+++ b/packages/remark-wiki-link/src/lib/html.ts
@@ -99,7 +99,7 @@ function html(opts: HtmlOptions = {}) {
     // remove leading # if the target is a heading on the same page
     const displayName = alias || target.replace(/^#/, "");
     // replace spaces with dashes and lowercase headings
-    const headingId = heading.replace(/\s+/, "-").toLowerCase();
+    const headingId = heading.replace(/\s+/g, "-").toLowerCase();
     let classNames = wikiLinkClassName;
     if (!matchingPermalink) {
       classNames += " " + newClassName;
diff --git a/packages/remark-wiki-link/test/micromarkExtensionWikiLink.spec.ts b/packages/remark-wiki-link/test/micromarkExtensionWikiLink.spec.ts
index 165717e7..663b885c 100644
--- a/packages/remark-wiki-link/test/micromarkExtensionWikiLink.spec.ts
+++ b/packages/remark-wiki-link/test/micromarkExtensionWikiLink.spec.ts
@@ -324,12 +324,11 @@ describe("micromark-extension-wiki-link", () => {
 
   describe("Links with special characters", () => {
     test("parses a link with special characters and symbols", () => {
-      const serialized = micromark("[[li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\]]", "ascii", {
+      const serialized = micromark("[[li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#LI NK-W(i)th-àcèô íã_a(n)d_uNdErlinE!:ª%@'*º$ °~./\\]]", "ascii", {
         extensions: [syntax()],
         htmlExtensions: [html() as any],
       });
-      const prefixExpected = '<p><a href="li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@\'*º$ °~./\\#'; // after the '#' symbol it's replacing spaces with dashes randomly not permiting create expected output after the symbol
-      expect(serialized).toBe(prefixExpected + serialized.substring(prefixExpected.length, serialized.length));
+      expect(serialized).toBe(`<p><a href="li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li-nk-w(i)th-àcèô-íã_a(n)d_underline!:ª%@'*º$-°~./\\" class="internal new">li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#LI NK-W(i)th-àcèô íã_a(n)d_uNdErlinE!:ª%@'*º$ °~./\\</a></p>`);
     });
   })
 });
diff --git a/packages/remark-wiki-link/test/remarkWikiLink.spec.ts b/packages/remark-wiki-link/test/remarkWikiLink.spec.ts
index e8f72a88..276038fc 100644
--- a/packages/remark-wiki-link/test/remarkWikiLink.spec.ts
+++ b/packages/remark-wiki-link/test/remarkWikiLink.spec.ts
@@ -365,7 +365,7 @@ describe("remark-wiki-link", () => {
     test("parses a link with special characters and symbols", () => {
       const processor = unified().use(markdown).use(wikiLinkPlugin);
 
-      let ast = processor.parse("[[li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li-nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\]]");
+      let ast = processor.parse("[[li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li-nk-w(i)th-àcèô íã_a(n)D_UNDERLINE!:ª%@'*º$ °~./\\]]");
       ast = processor.runSync(ast);
       expect(select("wikiLink", ast)).not.toEqual(null);
 
@@ -378,10 +378,10 @@ describe("remark-wiki-link", () => {
           "internal new"
         );
         expect((node.data?.hProperties as any).href).toEqual(
-          "li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li-nk-w(i)th-àcèô-íã_a(n)d_underline!:ª%@'*º$ °~./\\"
+          "li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li-nk-w(i)th-àcèô-íã_a(n)d_underline!:ª%@'*º$-°~./\\"
         );
         expect((node.data?.hChildren as any)[0].value).toEqual(
-          "li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li-nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\"
+          "li nk-w(i)th-àcèô íã_a(n)d_underline!:ª%@'*º$ °~./\\#li-nk-w(i)th-àcèô íã_a(n)D_UNDERLINE!:ª%@'*º$ °~./\\"
         );
       })
     });