diff --git a/src/inclusive_map.rs b/src/inclusive_map.rs
index 9f17534..bbb1f80 100644
--- a/src/inclusive_map.rs
+++ b/src/inclusive_map.rs
@@ -959,6 +959,7 @@ mod tests {
     }
 
     #[proptest]
+    #[allow(clippy::len_zero)]
     fn test_len(mut map: RangeInclusiveMap<u64, String>) {
         assert_eq!(map.len(), map.iter().count());
         assert_eq!(map.is_empty(), map.len() == 0);
diff --git a/src/inclusive_set.rs b/src/inclusive_set.rs
index c46aa79..1077698 100644
--- a/src/inclusive_set.rs
+++ b/src/inclusive_set.rs
@@ -497,6 +497,7 @@ mod tests {
     }
 
     #[proptest]
+    #[allow(clippy::len_zero)]
     fn test_len(mut map: RangeInclusiveSet<u64>) {
         assert_eq!(map.len(), map.iter().count());
         assert_eq!(map.is_empty(), map.len() == 0);
diff --git a/src/map.rs b/src/map.rs
index 9b0aabd..f4167a0 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -855,6 +855,7 @@ mod tests {
     }
 
     #[proptest]
+    #[allow(clippy::len_zero)]
     fn test_len(mut map: RangeMap<u64, String>) {
         assert_eq!(map.len(), map.iter().count());
         assert_eq!(map.is_empty(), map.len() == 0);
diff --git a/src/set.rs b/src/set.rs
index a672f38..a48aa65 100644
--- a/src/set.rs
+++ b/src/set.rs
@@ -468,6 +468,7 @@ mod tests {
     }
 
     #[proptest]
+    #[allow(clippy::len_zero)]
     fn test_len(mut map: RangeSet<u64>) {
         assert_eq!(map.len(), map.iter().count());
         assert_eq!(map.is_empty(), map.len() == 0);