diff --git a/networkframe/networkframe.py b/networkframe/networkframe.py
index 2bcb9c3..528e87d 100644
--- a/networkframe/networkframe.py
+++ b/networkframe/networkframe.py
@@ -1263,7 +1263,7 @@ def k_hop_aggregation(
         drop_non_numeric=True,
         n_jobs=-1,
         verbose=False,
-        engine="pandas",
+        engine="auto",
     ):
         if k < 0:
             raise ValueError("k must be non-negative.")
@@ -1271,6 +1271,14 @@ def k_hop_aggregation(
         if isinstance(aggregations, str):
             aggregations = [aggregations]
 
+        if engine == "auto":
+            if not all([isinstance(x, str) for x in aggregations]) or not all(
+                [x in ["mean", "sum", "std"] for x in aggregations]
+            ):
+                engine = "pandas"
+            else:
+                engine = "scipy"
+
         nodes = self.nodes
         if drop_non_numeric:
             nodes = nodes.select_dtypes(include=[np.number])