diff --git a/Makefile b/Makefile
index 9c0198b0..164ecc64 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ tests_src = tests
 docs_src = docs/src
 all_src = $(pkg_src) $(tests_src)
 
-isort = isort -rc $(all_src)
+isort = isort $(all_src)
 autoflake = autoflake -r --remove-all-unused-imports --ignore-init-module-imports $(all_src)
 black = black $(all_src)
 flake8 = flake8 $(all_src)
diff --git a/fastapi_restful/tasks.py b/fastapi_restful/tasks.py
index 0cbe6dd3..de6b9fb7 100644
--- a/fastapi_restful/tasks.py
+++ b/fastapi_restful/tasks.py
@@ -15,7 +15,7 @@
 def repeat_every(
     *,
     seconds: float,
-    wait_first: bool = False,
+    wait_first: float = None,
     logger: Optional[logging.Logger] = None,
     raise_exceptions: bool = False,
     max_repetitions: Optional[int] = None,
@@ -30,8 +30,8 @@ def repeat_every(
     ----------
     seconds: float
         The number of seconds to wait between repeated calls
-    wait_first: bool (default False)
-        If True, the function will wait for a single period before the first call
+    wait_first: float (default None)
+        If not None, the function will wait for the given duration before the first call
     logger: Optional[logging.Logger] (default None)
         The logger to use to log any exceptions raised by calls to the decorated function.
         If not provided, exceptions will not be logged by this function (though they may be handled by the event loop).
@@ -56,8 +56,8 @@ async def wrapped() -> None:
 
             async def loop() -> None:
                 nonlocal repetitions
-                if wait_first:
-                    await asyncio.sleep(seconds)
+                if wait_first is not None:
+                    await asyncio.sleep(wait_first)
                 while max_repetitions is None or repetitions < max_repetitions:
                     try:
                         if is_coroutine:
diff --git a/scripts/develop.sh b/scripts/develop.sh
index 55c119b2..07f234a9 100755
--- a/scripts/develop.sh
+++ b/scripts/develop.sh
@@ -44,10 +44,9 @@ check_for_python3
 check_for_poetry
 
 set -x
-poetry run pip install -r requirements.txt
 poetry install
 
 { set +x; } 2>/dev/null
 echo ""
-echo "Virtual environment interpreter installed at:"
-poetry run python -c "import sys; print(sys.executable)"
+echo "Virtual environment interpreter details:"
+poetry env info
diff --git a/tests/test_tasks.py b/tests/test_tasks.py
index 8f2bd654..e7ebfd5d 100644
--- a/tests/test_tasks.py
+++ b/tests/test_tasks.py
@@ -50,12 +50,12 @@ def repeatedly_print_hello() -> None:
 
 @pytest.mark.asyncio
 async def test_repeat_print_wait(capsys: CaptureFixture) -> None:
-    @repeat_every(seconds=0.07, max_repetitions=3, wait_first=True)
-    def repeatedly_print_hello() -> None:
+    @repeat_every(seconds=0.07, max_repetitions=3, wait_first=0.1)
+    async def repeatedly_print_hello() -> None:
         print("hello")
 
     await repeatedly_print_hello()
-    await asyncio.sleep(0.1)
+    await asyncio.sleep(0.15)
     out, err = capsys.readouterr()
     assert out == "hello\n" * 1
     assert err == ""