diff --git a/src/core.c b/src/core.c
index c0677944..4af316c0 100644
--- a/src/core.c
+++ b/src/core.c
@@ -3256,7 +3256,7 @@ __cold const char *mdbx_liberr2str(int errnum) {
       " or environment is already used while opening with MDBX_EXCLUSIVE flag",
   };
 
-  if (errnum >= MDBX_KEYEXIST && errnum <= MDBX_LAST_LMDB_ERRCODE) {
+  if (errnum >= MDBX_KEYEXIST && errnum <= MDBX_BUSY) {
     int i = errnum - MDBX_KEYEXIST;
     return tbl[i];
   }
@@ -19391,7 +19391,11 @@ __dll_export
 #endif /* MDBX_BUILD_FLAGS */
 #if !(defined(MDBX_BUILD_FLAGS_CONFIG) || defined(MDBX_BUILD_FLAGS))
     "undefined (please use correct build script)"
+#ifdef _MSC_VER
+#pragma message("warning: Build flags undefined. Please use correct build script")
+#else
 #warning "Build flags undefined. Please use correct build script"
+#endif // _MSC_VER
 #endif
 };
 
diff --git a/src/lck-posix.c b/src/lck-posix.c
index 3176cec1..e0d9a801 100644
--- a/src/lck-posix.c
+++ b/src/lck-posix.c
@@ -733,7 +733,11 @@ static int __cold mdbx_ipclock_failed(MDBX_env *env, mdbx_ipclock_t *ipc,
 #elif MDBX_LOCKING == MDBX_LOCKING_POSIX1988
   (void)ipc;
 #elif MDBX_LOCKING == MDBX_LOCKING_FUTEX
+#ifdef _MSC_VER
+#pragma message("warning: TODO")
+#else
 #warning "TODO"
+#endif
   (void)ipc;
 #else
 #error "FIXME"