diff --git a/.changeset/chilly-rockets-bow.md b/.changeset/chilly-rockets-bow.md
new file mode 100644
index 0000000000..b45864a643
--- /dev/null
+++ b/.changeset/chilly-rockets-bow.md
@@ -0,0 +1,5 @@
+---
+'@rocket.chat/fuselage': patch
+---
+
+Fixes a bug that adds an extra whitespace when concatenating class names with `appendClassName`
diff --git a/packages/fuselage/src/components/AutoComplete/__snapshots__/AutoComplete.spec.tsx.snap b/packages/fuselage/src/components/AutoComplete/__snapshots__/AutoComplete.spec.tsx.snap
index 39f1090330..453f640da8 100644
--- a/packages/fuselage/src/components/AutoComplete/__snapshots__/AutoComplete.spec.tsx.snap
+++ b/packages/fuselage/src/components/AutoComplete/__snapshots__/AutoComplete.spec.tsx.snap
@@ -12,7 +12,7 @@ exports[`[AutoComplete Rendering] renders CustomItem without crashing 1`] = `
>
@@ -43,7 +43,7 @@ exports[`[AutoComplete Rendering] renders CustomSelected without crashing 1`] =
>
@@ -172,7 +172,7 @@ exports[`[AutoComplete Rendering] renders Multiple without crashing 1`] = `
>