diff --git a/src/include/deepstate/DeepState.h b/src/include/deepstate/DeepState.h
index 03376c0..374e3cd 100644
--- a/src/include/deepstate/DeepState.h
+++ b/src/include/deepstate/DeepState.h
@@ -55,7 +55,8 @@ DEEPSTATE_BEGIN_EXTERN_C
 
 DECLARE_string(input_test_dir);
 DECLARE_string(output_test_dir);
-DECLARE_string(take_over);
+
+DECLARE_bool(take_over);
 
 enum {
   DeepState_InputSize = 8192
diff --git a/src/lib/DeepState.c b/src/lib/DeepState.c
index 3361455..7fe5de4 100644
--- a/src/lib/DeepState.c
+++ b/src/lib/DeepState.c
@@ -30,7 +30,8 @@ DEFINE_uint(num_workers, 1,
 
 DEFINE_string(input_test_dir, "", "Directory of saved tests to run.");
 DEFINE_string(output_test_dir, "", "Directory where tests will be saved.");
-DEFINE_string(take_over, "", "Replay test cases in take-over mode.");
+
+DEFINE_bool(take_over, false, "Replay test cases in take-over mode.");
 
 /* Pointer to the last registers DeepState_TestInfo data structure */
 struct DeepState_TestInfo *DeepState_LastTestInfo = NULL;