diff --git a/src/adapters/filter.rs b/src/adapters/filter.rs
index 581f667..bf2a469 100644
--- a/src/adapters/filter.rs
+++ b/src/adapters/filter.rs
@@ -23,7 +23,7 @@ impl<I, P> Filter<I, P> {
 
 impl<I: fmt::Debug, P> fmt::Debug for Filter<I, P> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Filter").field("iter", &self.iter).finish()
+        f.debug_struct("Filter").field("iter", &self.iter).finish_non_exhaustive()
     }
 }
 
diff --git a/src/adapters/filter_map.rs b/src/adapters/filter_map.rs
index b54f6eb..486e197 100644
--- a/src/adapters/filter_map.rs
+++ b/src/adapters/filter_map.rs
@@ -25,7 +25,7 @@ impl<I: fmt::Debug, F> fmt::Debug for FilterMap<I, F> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("FilterMap")
             .field("iter", &self.iter)
-            .finish()
+            .finish_non_exhaustive()
     }
 }
 
diff --git a/src/adapters/map.rs b/src/adapters/map.rs
index e851415..f9b878f 100644
--- a/src/adapters/map.rs
+++ b/src/adapters/map.rs
@@ -23,7 +23,7 @@ impl<I, F> Map<I, F> {
 
 impl<I: fmt::Debug, F> fmt::Debug for Map<I, F> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Map").field("iter", &self.iter).finish()
+        f.debug_struct("Map").field("iter", &self.iter).finish_non_exhaustive()
     }
 }
 
diff --git a/src/adapters/take_while.rs b/src/adapters/take_while.rs
index 58abaac..079f264 100644
--- a/src/adapters/take_while.rs
+++ b/src/adapters/take_while.rs
@@ -27,7 +27,7 @@ impl<I: fmt::Debug, P> fmt::Debug for TakeWhile<I, P> {
         f.debug_struct("TakeWhile")
             .field("iter", &self.iter)
             .field("done", &self.done)
-            .finish()
+            .finish_non_exhaustive()
     }
 }