diff --git a/plotnine/geoms/annotation_logticks.py b/plotnine/geoms/annotation_logticks.py
index 5fae9bc11..49aa29627 100644
--- a/plotnine/geoms/annotation_logticks.py
+++ b/plotnine/geoms/annotation_logticks.py
@@ -19,13 +19,11 @@
 
     from matplotlib.axes import Axes
     from mizani.transforms import trans
-    from typing_extensions import TypeGuard
 
     from plotnine.coords.coord import coord
     from plotnine.facets.layout import Layout
     from plotnine.geoms.geom import geom
     from plotnine.iapi import panel_view
-    from plotnine.scales.scale import scale
     from plotnine.typing import (
         AnyArray,
         TupleFloat2,
@@ -299,7 +297,3 @@ def __init__(
             lengths=lengths,
             base=base,
         )
-
-
-def is_continuous_scale(sc: scale) -> TypeGuard[ScaleContinuous]:
-    return isinstance(sc, ScaleContinuous)
diff --git a/tests/test_aes.py b/tests/test_aes.py
index ceae98b96..514709704 100644
--- a/tests/test_aes.py
+++ b/tests/test_aes.py
@@ -1,5 +1,6 @@
 import numpy as np
 import pandas as pd
+import pytest
 
 from plotnine import (
     aes,
@@ -71,7 +72,9 @@ def test_stat_ecdf(self):
             + stat_ecdf()
             + scale_y_log10()
         )
-        assert p == "stat_ecdf"
+
+        with pytest.warns(RuntimeWarning):
+            assert p == "stat_ecdf"
 
     def test_stat_bin_2d(self):
         data = pd.DataFrame({"x": [1, 10, 100, 1000], "y": range(4)})
diff --git a/tests/test_annotation_logticks.py b/tests/test_annotation_logticks.py
index d024cac81..632ea8977 100644
--- a/tests/test_annotation_logticks.py
+++ b/tests/test_annotation_logticks.py
@@ -34,7 +34,6 @@ def test_annotation_logticks():
             panel_grid_major=element_line(color="red"),
         )
     )
-
     assert p == "annotation_logticks"
 
 
@@ -172,8 +171,10 @@ def test_wrong_bases():
         + geom_point()
     )
 
-    with pytest.warns(PlotnineWarning):
+    with pytest.warns() as rec:
         p.draw_test()
+        rec.pop(PlotnineWarning)
+        rec.pop(RuntimeWarning)
 
     # x axis not transform, but ticks requested for a different base
     p = (
@@ -205,7 +206,7 @@ def test_wrong_bases():
         + geom_point()
     )
 
-    with pytest.warns(PlotnineWarning):
+    with pytest.warns() as rec:
         p.draw_test()
 
     # x axis is discrete + coord flip.
diff --git a/tests/test_position.py b/tests/test_position.py
index 8c6ded1be..6972de9f9 100644
--- a/tests/test_position.py
+++ b/tests/test_position.py
@@ -115,7 +115,10 @@ def test_stack_non_linear_scale():
         + geom_col()
         + scale_y_log10()
     )
-    assert p == "stack-non-linear-scale"
+
+    with pytest.warns(RuntimeWarning) as rec:
+        assert p == "stack-non-linear-scale"
+        assert len(rec) == 1
 
 
 def test_fill():