diff --git a/src/de.rs b/src/de.rs
index 6a55fea..7157ced 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -575,10 +575,12 @@ mod test {
             578437695752307201i64,
             from_slice(&[1, 2, 3, 4, 5, 6, 7, 8]).unwrap()
         );
-        assert_eq!(
-            21345817372864405881847059188222722561i128,
-            from_slice(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]).unwrap()
-        );
+        serde::serde_if_integer128! {
+            assert_eq!(
+                21345817372864405881847059188222722561i128,
+                from_slice(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]).unwrap()
+            );
+        }
     }
 
     #[test]
@@ -590,10 +592,12 @@ mod test {
             578437695752307201u64,
             from_slice(&[1, 2, 3, 4, 5, 6, 7, 8]).unwrap()
         );
-        assert_eq!(
-            21345817372864405881847059188222722561u128,
-            from_slice(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]).unwrap()
-        );
+        serde::serde_if_integer128! {
+            assert_eq!(
+                21345817372864405881847059188222722561u128,
+                from_slice(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]).unwrap()
+            );
+        }
     }
 
     #[test]