diff --git a/Makefile b/Makefile
index 29b595d..e5e8744 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,8 @@ PACKAGE_DIR  := red
 # For the CI github actions workflow, we skip "make env" and set up the environment manually. In this case,
 # it's helpful to to set CONDA_ENV_RUN to be empty. However, for the documentation workflow, we want to override
 # this and keep the normal behavior. We override this by setting KEEP_CONDA_ENV_RUN to true in the documentation workflow.
-CONDA_ENV_RUN = $(if $(GITHUB_ACTIONS),$(if $(KEEP_CONDA_ENV_RUN),conda run --no-capture-output --name $(PACKAGE_NAME),),conda run --no-capture-output --name $(PACKAGE_NAME))
+SKIP_CONDA_ENV = $(and $(GITHUB_ACTIONS),$(not $(KEEP_CONDA_ENV_RUN)))
+CONDA_ENV_RUN = $(if $(SKIP_CONDA_ENV),,conda run --no-capture-output --name $(PACKAGE_NAME))
 
 TEST_ARGS := -v --cov=$(PACKAGE_NAME) --cov-report=term --cov-report=xml --junitxml=unit.xml --color=yes
 
diff --git a/docs/changelog.md b/docs/changelog.md
index 36bbc6c..d29ad5e 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.1.1] - 2024-09-29
+
+### Fixed
+
+- Ensure that equilibration detection functions return integer indices when times are not provided.
+
 ## [0.1.0] - 2024-09-23
 
 Initial release.
diff --git a/red/equilibration.py b/red/equilibration.py
index 4e3c097..5a747d9 100644
--- a/red/equilibration.py
+++ b/red/equilibration.py
@@ -123,7 +123,7 @@ def detect_equilibration_init_seq(
     if times is None:
         time_units = "index"
         # Convert times to indices.
-        times_valid: _npt.NDArray[_np.float64] = _np.arange(n_samples, dtype=_np.float64)
+        times_valid: _npt.NDArray[_np.int64 | _np.float64] = _np.arange(n_samples, dtype=_np.int64)
     else:
         # To satisfy type checking.
         times_valid = times
@@ -276,7 +276,7 @@ def detect_equilibration_window(
     if times is None:
         time_units = "index"
         # Convert times to indices.
-        times_valid: _npt.NDArray[_np.float64] = _np.arange(n_samples, dtype=_np.float64)
+        times_valid: _npt.NDArray[_np.int64 | _np.float64] = _np.arange(n_samples, dtype=_np.int64)
     else:
         # To satisfy type checking.
         times_valid = times
@@ -395,7 +395,7 @@ def get_paired_t_p_timeseries(
 
     # Convert times to indices if necessary.
     if times is None:
-        times = _np.arange(n_samples, dtype=_np.float64)
+        times = _np.arange(n_samples, dtype=_np.int64)
 
     # Check that times is match the number of samples.
     if n_samples != len(times):
diff --git a/red/plot.py b/red/plot.py
index 094ecbe..43aaca2 100644
--- a/red/plot.py
+++ b/red/plot.py
@@ -22,7 +22,7 @@
 def plot_timeseries(
     ax: _Axes,
     data: _npt.NDArray[_np.float64],
-    times: _npt.NDArray[_np.float64],
+    times: _npt.NDArray[_np.float64 | _np.int64],
     n_blocks: int = 100,
     time_units: str = "ns",
     y_label: str = r"$\Delta G$ / kcal mol$^{-1}$",
@@ -203,7 +203,7 @@ def plot_sse(
     sse: _npt.NDArray[_np.float64],
     max_lags: _Optional[_npt.NDArray[_np.float64]],
     window_sizes: _Optional[_npt.NDArray[_np.float64]],
-    times: _npt.NDArray[_np.float64],
+    times: _npt.NDArray[_np.float64 | _np.int64],
     time_units: str = "ns",
     variance_y_label: str = r"$\frac{1}{\sigma^2(\Delta G)}$ / kcal$^{-2}$ mol$^2$",
     reciprocal: bool = True,
@@ -409,8 +409,8 @@ def plot_equilibration_min_sse(
     subplot_spec: _gridspec.SubplotSpec,
     data: _npt.NDArray[_np.float64],
     sse_series: _npt.NDArray[_np.float64],
-    data_times: _npt.NDArray[_np.float64],
-    sse_times: _npt.NDArray[_np.float64],
+    data_times: _npt.NDArray[_np.float64 | _np.int64],
+    sse_times: _npt.NDArray[_np.float64 | _np.int64],
     max_lag_series: _Optional[_npt.NDArray[_np.float64]] = None,
     window_size_series: _Optional[_npt.NDArray[_np.float64]] = None,
     time_units: str = "ns",
diff --git a/red/tests/test_equilibration.py b/red/tests/test_equilibration.py
index 06a89d1..b67d4b9 100644
--- a/red/tests/test_equilibration.py
+++ b/red/tests/test_equilibration.py
@@ -27,6 +27,9 @@ def test_detect_equilibration_init_seq(example_timeseries, example_times, tmpdir
     # Compute the equilibration index.
     equil_idx, equil_g, equil_ess = detect_equilibration_init_seq(data=example_timeseries)
 
+    # Make sure that the index is a numpy int64
+    assert isinstance(equil_idx, np.int64)
+
     # Check that the equilibration index is correct.
     assert equil_idx == 398
     assert equil_g == pytest.approx(4.292145845594654, abs=1e-4)