diff --git a/sstable/src/lib.rs b/sstable/src/lib.rs
index ff8ff7767d..6237ea7dec 100644
--- a/sstable/src/lib.rs
+++ b/sstable/src/lib.rs
@@ -457,8 +457,8 @@ mod test {
     fn bound_strategy() -> impl Strategy<Value = Bound<String>> {
         prop_oneof![
             Just(Bound::<String>::Unbounded),
-            "[a-c]{0-5}".prop_map(|key| Bound::Included(key)),
-            "[a-c]{0-5}".prop_map(|key| Bound::Excluded(key)),
+            "[a-c]{0,5}".prop_map(|key| Bound::Included(key)),
+            "[a-c]{0,5}".prop_map(|key| Bound::Excluded(key)),
         ]
     }
 
@@ -483,7 +483,7 @@ mod test {
 
     proptest! {
         #[test]
-        fn test_proptest_sstable_ranges(words in prop::collection::btree_set("[a-c]{0-6}", 1..100),
+        fn test_proptest_sstable_ranges(words in prop::collection::btree_set("[a-c]{0,6}", 1..100),
             (lower_bound, upper_bound) in bounds_strategy(),
         ) {
             // TODO tweak block size.