diff --git a/src/decoupler/pl/_dotplot.py b/src/decoupler/pl/_dotplot.py
index 6cec585..86347cb 100644
--- a/src/decoupler/pl/_dotplot.py
+++ b/src/decoupler/pl/_dotplot.py
@@ -102,7 +102,7 @@ def dotplot(
     # Plot
     ns = (s_vals * scale * plt.rcParams["lines.markersize"]) ** 2
     bp.ax.grid(axis="x")
-    if vcenter:
+    if vcenter is not None:
         norm = TwoSlopeNorm(vmin=None, vcenter=vcenter, vmax=None)
     else:
         norm = None
diff --git a/tests/pl/test_dotplot.py b/tests/pl/test_dotplot.py
index 596f39e..92af7bd 100644
--- a/tests/pl/test_dotplot.py
+++ b/tests/pl/test_dotplot.py
@@ -20,7 +20,7 @@ def df():
     return df
 
 
-@pytest.mark.parametrize("vcenter", [None, 3])
+@pytest.mark.parametrize("vcenter", [None, 0, 3])
 def test_dotplot(
     df,
     vcenter,