diff --git a/c/interaction/interaction.c b/c/interaction/interaction.c
index 54c55bb..e10b8a3 100644
--- a/c/interaction/interaction.c
+++ b/c/interaction/interaction.c
@@ -186,7 +186,7 @@ PyInit_interaction(void)
 		return NULL;
 	}
 	import_array();
-	import_umath();
+	import_ufunc();
 
 	ufunc_interaction = PyUFunc_FromFuncAndDataAndSignature(
 			interaction_funcs