diff --git a/askama/src/filters/builtin.rs b/askama/src/filters/builtin.rs
index 0ab6a365..a7931460 100644
--- a/askama/src/filters/builtin.rs
+++ b/askama/src/filters/builtin.rs
@@ -473,11 +473,11 @@ impl<S: FastWritable, P: FastWritable> FastWritable for Pluralize<S, P> {
 ///     "b,c,"
 /// );
 /// ```
-pub fn reject<T: PartialEq>(
-    it: impl IntoIterator<Item = T>,
-    filter: T,
-) -> Result<impl Iterator<Item = T>, Infallible> {
-    Ok(it.into_iter().filter(move |v| v != &filter))
+pub fn reject<'a, T: PartialEq, U: IntoIterator<Item = T>>(
+    it: U,
+    filter: &'a T,
+) -> Result<impl Iterator<Item = T> + use<'a, T, U>, Infallible> {
+    Ok(it.into_iter().filter(move |v| v != filter))
 }
 
 /// Returns an iterator without filtered out values.
@@ -505,9 +505,9 @@ pub fn reject<T: PartialEq>(
 ///     );
 /// }
 /// ```
-pub fn reject_with<T: PartialEq, F: Fn(&T) -> bool>(
+pub fn reject_with<T: PartialEq, F: FnMut(&T) -> bool>(
     it: impl IntoIterator<Item = T>,
-    callback: F,
+    mut callback: F,
 ) -> Result<impl Iterator<Item = T>, Infallible> {
     Ok(it.into_iter().filter(move |v| !callback(v)))
 }
diff --git a/askama_derive/src/generator/filter.rs b/askama_derive/src/generator/filter.rs
index 9762c1dc..cc0a5524 100644
--- a/askama_derive/src/generator/filter.rs
+++ b/askama_derive/src/generator/filter.rs
@@ -260,9 +260,12 @@ impl<'a> Generator<'a, '_> {
         self.visit_arg(ctx, buf, input)?;
         buf.write(',');
         if extra_ampersand {
-            buf.write('&');
+            buf.write("&&(");
         }
         self.visit_arg(ctx, buf, filter)?;
+        if extra_ampersand {
+            buf.write(')');
+        }
         buf.write(")?");
         Ok(DisplayWrap::Wrapped)
     }