diff --git a/src/include/deepstate/DeepState.h b/src/include/deepstate/DeepState.h
index 163d921..03b0438 100644
--- a/src/include/deepstate/DeepState.h
+++ b/src/include/deepstate/DeepState.h
@@ -66,6 +66,7 @@ DECLARE_bool(abort_on_fail);
 DECLARE_bool(verbose_reads);
 DECLARE_bool(fuzz);
 DECLARE_bool(fuzz_save_passing);
+DECLARE_bool(no_fork);
 
 DECLARE_int(log_level);
 DECLARE_int(seed);
@@ -533,7 +534,7 @@ static void DeepState_RunTest(struct DeepState_TestInfo *test) {
 }
 
 /* Run a test case, but in libFuzzer, so not inside a fork. */
-static int DeepState_RunTestLLVM(struct DeepState_TestInfo *test) {
+static int DeepState_RunTestNoFork(struct DeepState_TestInfo *test) {
   /* Run the test. */
   if (!setjmp(DeepState_ReturnToRun)) {
     /* Convert uncaught C++ exceptions into a test failure. */
@@ -577,6 +578,9 @@ static int DeepState_RunTestLLVM(struct DeepState_TestInfo *test) {
 /* Fork and run `test`. */
 static enum DeepState_TestRunResult
 DeepState_ForkAndRunTest(struct DeepState_TestInfo *test) {
+  if (FLAG_no_fork) {
+    return DeepState_RunTestNoFork(test);
+  }
   pid_t test_pid = fork();
   if (!test_pid) {
     DeepState_RunTest(test);
diff --git a/src/lib/DeepState.c b/src/lib/DeepState.c
index b35c2b8..1e162ad 100644
--- a/src/lib/DeepState.c
+++ b/src/lib/DeepState.c
@@ -39,6 +39,7 @@ DEFINE_bool(abort_on_fail, false, "Abort on file replay failure (useful in file
 DEFINE_bool(verbose_reads, false, "Report on bytes being read during execution of test.");
 DEFINE_bool(fuzz, false, "Perform brute force unguided fuzzing.");
 DEFINE_bool(fuzz_save_passing, false, "Save passing tests during fuzzing.");
+DEFINE_bool(no_fork, false, "Don't fork when running a test.")
 
 DEFINE_int(log_level, 0, "Minimum level of logging to output.");
 DEFINE_int(seed, 0, "Seed for brute force fuzzing (uses time if not set).");
@@ -660,7 +661,7 @@ extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
 
   DeepState_Begin(test);
 
-  enum DeepState_TestRunResult result = DeepState_RunTestLLVM(test);
+  enum DeepState_TestRunResult result = DeepState_RunTestNoFork(test);
 
   const char* abort_check = getenv("LIBFUZZER_ABORT_ON_FAIL");
   if (abort_check != NULL) {