diff --git a/hog/recipes/common.py b/hog/recipes/common.py
index dd356738a66c35aae2a41ee08ec900cfb9c7cda6..611a25584f5864d47ef39163e6b2480a4bb962e8 100644
--- a/hog/recipes/common.py
+++ b/hog/recipes/common.py
@@ -16,6 +16,7 @@
 
 
 # Collects common imports for forming integrand and operator recipes.
+import sympy as sp
 from hog.math_helpers import dot, abs, det, double_contraction
 
-__all__ = ["dot", "abs", "det", "double_contraction"]
+__all__ = ["dot", "abs", "det", "double_contraction", "sp"]