diff --git a/spacy/tokens/doc.pyx b/spacy/tokens/doc.pyx
index 15f77d621..aec06d620 100644
--- a/spacy/tokens/doc.pyx
+++ b/spacy/tokens/doc.pyx
@@ -391,7 +391,9 @@ cdef class Doc:
             return 0.0
         vector = self.vector
         xp = get_array_module(vector)
-        return xp.dot(vector, other.vector) / (self.vector_norm * other.vector_norm)
+        result = xp.dot(vector, other.vector) / (self.vector_norm * other.vector_norm)
+        # ensure we get a scalar back (numpy does this automatically but cupy doesn't)
+        return result.item()
 
     @property
     def has_vector(self):