diff --git a/src/tree.rs b/src/tree.rs
index b7dd6d4..4d4695b 100644
--- a/src/tree.rs
+++ b/src/tree.rs
@@ -319,7 +319,7 @@ impl<T> Node<T> {
 
                     // Similarly, we are inserting a parameter suffix and this node already has a parameter
                     // prefix, we have a prefix-suffix conflict.
-                    let suffix = remaining.slice_off(wildcard.end);
+                    let suffix = remaining.slice_until(terminator).slice_off(wildcard.end);
                     if !matches!(*suffix, b"" | b"/") && node.prefix_wild_child_in_segment() {
                         return Err(InsertError::conflict(&route, remaining, node));
                     }
diff --git a/tests/insert.rs b/tests/insert.rs
index 47fc3a2..44864d4 100644
--- a/tests/insert.rs
+++ b/tests/insert.rs
@@ -255,6 +255,8 @@ fn prefix_suffix_conflict() {
         ("/x15/prefix{a}", Ok(())),
         ("/x16/{*rest}", Ok(())),
         ("/x16/prefix{a}suffix", Ok(())),
+        ("/x17/prefix{a}/z", Ok(())),
+        ("/x18/prefix{a}/z", Ok(())),
     ])
     .run()
 }