diff --git a/test/fuse_integration/mounted_unix.go b/test/fuse_integration/mounted_unix.go
index 85889b9ac4..471b8bb655 100644
--- a/test/fuse_integration/mounted_unix.go
+++ b/test/fuse_integration/mounted_unix.go
@@ -17,8 +17,10 @@ func deviceID(path string) (uint64, error) {
 }
 
 // mountedAt reports whether something is actually mounted at path: a plain
-// directory shares its parent's device, a mount point does not.
+// directory shares its parent's device, a mount point does not. The path is
+// cleaned first so a trailing slash does not make Dir return the mount itself.
 func mountedAt(path string) bool {
+	path = filepath.Clean(path)
 	dev, err := deviceID(path)
 	if err != nil {
 		return false
diff --git a/test/fuse_integration/mounted_unix_test.go b/test/fuse_integration/mounted_unix_test.go
new file mode 100644
index 0000000000..ed47185519
--- /dev/null
+++ b/test/fuse_integration/mounted_unix_test.go
@@ -0,0 +1,19 @@
+//go:build unix
+
+package fuse
+
+import "testing"
+
+func TestMountedAt(t *testing.T) {
+	for _, p := range []string{"/proc", "/proc/"} {
+		if !mountedAt(p) {
+			t.Errorf("mountedAt(%q) = false, want true", p)
+		}
+	}
+	plain := t.TempDir()
+	for _, p := range []string{plain, plain + "/"} {
+		if mountedAt(p) {
+			t.Errorf("mountedAt(%q) = true, want false", p)
+		}
+	}
+}