diff --git a/src/functions.rs b/src/functions.rs
index 27351ad..06f681d 100644
--- a/src/functions.rs
+++ b/src/functions.rs
@@ -688,7 +688,9 @@ mod test {
     use std::f64::EPSILON;
     use std::os::raw::c_double;
 
-    use crate::functions::{Aggregate, Context, WindowAggregate};
+    use crate::functions::{Aggregate, Context};
+    #[cfg(feature = "window")]
+    use crate::functions::WindowAggregate;
     use crate::{Connection, Error, Result, NO_PARAMS};
 
     fn half(ctx: &Context<'_>) -> Result<c_double> {