diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml
index baa3a61..b55f181 100644
--- a/.github/workflows/fuzz.yml
+++ b/.github/workflows/fuzz.yml
@@ -10,7 +10,10 @@ permissions:
 jobs:
   fuzz-ach:
     name: Fuzz Metro2
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
     timeout-minutes: 12
 
     steps:
diff --git a/test/fuzz/fuzz_test.go b/test/fuzz/fuzz_test.go
index 6487ff4..622faa8 100644
--- a/test/fuzz/fuzz_test.go
+++ b/test/fuzz/fuzz_test.go
@@ -36,6 +36,9 @@ func FuzzReader(f *testing.F) {
 		}
 
 		f.Validate()
+
+		f.String(true)
+		f.String(false)
 	})
 }
 
@@ -43,6 +46,8 @@ func populateCorpus(f *testing.F) {
 	f.Helper()
 
 	err := filepath.Walk(filepath.Join("..", "testdata"), func(path string, info fs.FileInfo, _ error) error {
+		path = filepath.ToSlash(path)
+
 		if info.IsDir() {
 			return nil
 		}