diff --git a/hashing.hh b/hashing.hh
index 65501a9d45..59026fd4f7 100644
--- a/hashing.hh
+++ b/hashing.hh
@@ -46,7 +46,7 @@ GCC6_CONCEPT(
     template<typename H>
     concept bool Hasher() {
         return requires(H& h, const char* ptr, size_t size) {
-            { h.update(ptr, size) } -> void
+            { h.update(ptr, size) } -> void;
         };
     }
 )
diff --git a/mutation_fragment.hh b/mutation_fragment.hh
index 4fcbc642c9..d22e1097d1 100644
--- a/mutation_fragment.hh
+++ b/mutation_fragment.hh
@@ -636,8 +636,8 @@ GCC6_CONCEPT(
     template<typename F>
     concept bool StreamedMutationTranformer() {
         return requires(F f, mutation_fragment mf, schema_ptr s) {
-            { f(std::move(mf)) } -> mutation_fragment
-            { f(s) } -> schema_ptr
+            { f(std::move(mf)) } -> mutation_fragment;
+            { f(s) } -> schema_ptr;
         };
     }
 )
diff --git a/partition_version.cc b/partition_version.cc
index 1d1fbb2d98..1831716247 100644
--- a/partition_version.cc
+++ b/partition_version.cc
@@ -90,7 +90,7 @@ GCC6_CONCEPT(
 template<typename U, typename Domain, typename CoDomain>
 concept bool Mapper() {
     return requires(U obj, const Domain& src) {
-        { obj(src) } -> const CoDomain&
+        { obj(src) } -> const CoDomain&;
     };
 }
 
diff --git a/sstables/partition.cc b/sstables/partition.cc
index 01fb0366fb..a7d93e9d53 100644
--- a/sstables/partition.cc
+++ b/sstables/partition.cc
@@ -82,7 +82,7 @@ concept bool RowConsumer() {
         { t.io_priority() } -> const io_priority_class&;
         { t.is_mutation_end() } -> bool;
         { t.setup_for_partition(pk) } -> void;
-        { t.push_ready_fragments() } -> void
+        { t.push_ready_fragments() } -> void;
         { t.maybe_skip() } -> std::optional<position_in_partition_view>;
         { t.fast_forward_to(std::move(cr), timeout) } -> std::optional<position_in_partition_view>;
     };
diff --git a/sstables/types.hh b/sstables/types.hh
index fa80ce1f94..0bd2b6d991 100644
--- a/sstables/types.hh
+++ b/sstables/types.hh
@@ -53,7 +53,7 @@ GCC6_CONCEPT(
 template<typename T>
 concept bool Writer() {
     return requires(T& wr, const char* data, size_t size) {
-        { wr.write(data, size) } -> void
+        { wr.write(data, size) } -> void;
     };
 }
 )
diff --git a/test/boost/sstable_test.hh b/test/boost/sstable_test.hh
index efbfde2b80..6f708fbdb4 100644
--- a/test/boost/sstable_test.hh
+++ b/test/boost/sstable_test.hh
@@ -243,7 +243,7 @@ inline std::array<sstables::sstable::version_types, 3> all_sstable_versions = {
 };
 
 template<typename AsyncAction>
-GCC6_CONCEPT( requires requires (AsyncAction aa, sstables::sstable::version_types& c) { { aa(c) } -> future<> } )
+GCC6_CONCEPT( requires requires (AsyncAction aa, sstables::sstable::version_types& c) { { aa(c) } -> future<>; } )
 inline
 future<> for_each_sstable_version(AsyncAction action) {
     return seastar::do_for_each(all_sstable_versions, std::move(action));