diff --git a/lib/fs/folding.go b/lib/fs/folding.go
index 5ba6d4530..20887b95e 100644
--- a/lib/fs/folding.go
+++ b/lib/fs/folding.go
@@ -19,7 +19,7 @@ import (
 func UnicodeLowercaseNormalized(s string) string {
 	i := firstCaseChange(s)
 	if i == -1 {
-		return s
+		return norm.NFC.String(s)
 	}
 
 	var rs strings.Builder
diff --git a/lib/fs/folding_test.go b/lib/fs/folding_test.go
index f19cfb4f1..c3e05fa8b 100644
--- a/lib/fs/folding_test.go
+++ b/lib/fs/folding_test.go
@@ -46,6 +46,7 @@ var caseCases = [][2]string{
 	{"\u212A", "k"},
 	// Folding renormalizes to NFC
 	{"A\xCC\x88", "\xC3\xA4"}, // ä
+	{"a\xCC\x88", "\xC3\xA4"}, // ä
 }
 
 func TestUnicodeLowercaseNormalized(t *testing.T) {