diff --git a/internal/literals/fuzz_test.go b/internal/literals/fuzz_test.go
index 1dd7abd..5855580 100644
--- a/internal/literals/fuzz_test.go
+++ b/internal/literals/fuzz_test.go
@@ -72,7 +72,9 @@ func FuzzObfuscate(f *testing.F) {
 
 		// Obfuscate the literals and print the source back.
 		rand := mathrand.New(mathrand.NewSource(randSeed))
-		srcSyntax = literals.Obfuscate(rand, srcSyntax, &info, nil)
+		srcSyntax = literals.Obfuscate(rand, srcSyntax, &info, nil, func(rand *mathrand.Rand, baseName string) string {
+			return fmt.Sprintf("%s%d", baseName, rand.Uint64())
+		})
 		count := tdirCounter.Add(1)
 		f, err := os.Create(filepath.Join(tdir, fmt.Sprintf("src_%d.go", count)))
 		qt.Assert(t, qt.IsNil(err))