diff --git a/holoviews/core/data/dictionary.py b/holoviews/core/data/dictionary.py
index b8ae1d0093..e0f9e827d0 100644
--- a/holoviews/core/data/dictionary.py
+++ b/holoviews/core/data/dictionary.py
@@ -213,7 +213,7 @@ def values(cls, dataset, dim, expanded=True, flat=True):
         if np.isscalar(values):
             if not expanded:
                 return np.array([values])
-            values = np.full(len(dataset), values)
+            values = np.full(len(dataset), values, dtype=np.array(values).dtype)
         else:
             if not expanded:
                 return util.unique_array(values)