diff --git a/src/mdbx.c b/src/mdbx.c
index 30ec16fb..117491eb 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -4189,10 +4189,8 @@ bailout:
 static int __cold mdbx_env_map(MDBX_env *env, size_t usedsize) {
   int rc = mdbx_mmap(env->me_flags, &env->me_dxb_mmap, env->me_dbgeo.now,
                      env->me_dbgeo.upper);
-  if (unlikely(rc != MDBX_SUCCESS)) {
-    env->me_map = NULL;
+  if (unlikely(rc != MDBX_SUCCESS))
     return rc;
-  }
 
 #ifdef MADV_DONTFORK
   if (madvise(env->me_map, env->me_mapsize, MADV_DONTFORK))
@@ -5125,10 +5123,8 @@ static void __cold mdbx_env_close0(MDBX_env *env) {
     env->me_fd = INVALID_HANDLE_VALUE;
   }
 
-  if (env->me_lck) {
+  if (env->me_lck)
     mdbx_munmap(&env->me_lck_mmap);
-    env->me_lck = nullptr;
-  }
   env->me_pid = 0;
   env->me_oldest = nullptr;
 
diff --git a/src/osal.c b/src/osal.c
index 8595dec7..c4ecbd37 100644
--- a/src/osal.c
+++ b/src/osal.c
@@ -781,7 +781,7 @@ int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t must, size_t limit) {
   map->length = 0;
   map->current = 0;
   map->section = NULL;
-  map->address = MAP_FAILED;
+  map->address = nullptr;
 
   if (GetFileType(map->fd) != FILE_TYPE_DISK)
     return ERROR_FILE_OFFLINE;
@@ -874,7 +874,7 @@ int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t must, size_t limit) {
   if (!NT_SUCCESS(rc))
     return ntstatus2errcode(rc);
 
-  map->address = NULL;
+  map->address = nullptr;
   SIZE_T ViewSize = (flags & MDBX_RDONLY) ? must : limit;
   rc = NtMapViewOfSection(
       map->section, GetCurrentProcess(), &map->address,
@@ -889,7 +889,7 @@ int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t must, size_t limit) {
   if (!NT_SUCCESS(rc)) {
     NtClose(map->section);
     map->section = 0;
-    map->address = MAP_FAILED;
+    map->address = nullptr;
     return ntstatus2errcode(rc);
   }
 
@@ -907,6 +907,7 @@ int mdbx_mmap(int flags, mdbx_mmap_t *map, size_t must, size_t limit) {
     return MDBX_SUCCESS;
   }
   map->length = 0;
+  map->address = nullptr;
   return errno;
 #endif
 }