diff --git a/syscall_filter_unittest.cc b/syscall_filter_unittest.cc
index a1f546c..98a28c3 100644
--- a/syscall_filter_unittest.cc
+++ b/syscall_filter_unittest.cc
@@ -980,6 +980,22 @@
   ASSERT_EQ(res, -1);
 }
 
+TEST_F(FileTest, invalid_return) {
+  const char *policy =
+      "read:arg0 == 0; ;";
+
+  FILE *policy_file = write_policy_to_pipe(policy, strlen(policy));
+  ASSERT_NE(policy_file, nullptr);
+  int res = compile_file(
+      policy_file, head_, &arg_blocks_, &labels_, USE_RET_KILL, NO_LOGGING, 0);
+  fclose(policy_file);
+
+  /*
+   * Policy is malformed, but process should not crash.
+   */
+  ASSERT_EQ(res, -1);
+}
+
 TEST_F(FileTest, seccomp_mode1) {
   const char *policy =
       "read: 1\n"