diff --git a/src/library/blast/context.cpp b/src/library/blast/context.cpp
index 5c1b766f2..e3cfa2580 100644
--- a/src/library/blast/context.cpp
+++ b/src/library/blast/context.cpp
@@ -4,6 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 
 Author: Leonardo de Moura
 */
+#include <string>
 #include "library/kernel_serializer.h"
 #include "library/blast/context.h"
 
diff --git a/src/library/blast/state.h b/src/library/blast/state.h
index 69fa2f032..751620c72 100644
--- a/src/library/blast/state.h
+++ b/src/library/blast/state.h
@@ -10,6 +10,5 @@ Author: Leonardo de Moura
 namespace lean {
 namespace blast {
 class state {
-
 };
 }}
diff --git a/src/runtime/cpp/lean_runtime.cpp b/src/runtime/cpp/lean_runtime.cpp
index 026ae715b..ed4d06663 100644
--- a/src/runtime/cpp/lean_runtime.cpp
+++ b/src/runtime/cpp/lean_runtime.cpp
@@ -68,7 +68,7 @@ void * alloc_obj(unsigned n) {
 
 obj_cell::obj_cell(unsigned cidx, unsigned sz, obj const * fs):
     m_rc(0), m_kind(static_cast<unsigned>(obj_kind::Constructor)), m_size(sz), m_cidx(cidx) {
-    static_assert(sizeof(obj_cell) % sizeof(void*) == 0); // make sure the hack used to store obj_cell fields satisfies alignment constraints.
+    static_assert(sizeof(obj_cell) % sizeof(void*) == 0); // make sure the hack used to store obj_cell fields satisfies alignment constraints. // NOLINT
     void ** mem = field_addr();
     for (unsigned i = 0; i < sz; i++, mem++)
         new (mem) obj(fs[i]);