diff --git a/CHANGELOG.md b/CHANGELOG.md
index ceec3ff..6a23eb8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## 3.5.3
 
 - New typed exceptions: `UniqueViolationException`, `ForeignKeyViolationException`. [#416](https://github.com/isoos/postgresql-dart/pull/416) by [hurrba](https://github.com/hurrba)
+- Fix: don't reuse pool connections that are closed/closing. [#417](https://github.com/isoos/postgresql-dart/pull/417) by [davidmartos96](https://github.com/davidmartos96)
 
 ## 3.5.2
 
diff --git a/lib/src/pool/pool_impl.dart b/lib/src/pool/pool_impl.dart
index c986e34..e70ee0a 100644
--- a/lib/src/pool/pool_impl.dart
+++ b/lib/src/pool/pool_impl.dart
@@ -232,7 +232,7 @@ class _PoolConnection implements Connection {
       this._pool, this._endpoint, this._connectionSettings, this._connection);
 
   bool _mayReuse(Endpoint endpoint, ResolvedConnectionSettings settings) {
-    if (_isInUse || endpoint != _endpoint || _isExpired()) {
+    if (_isInUse || endpoint != _endpoint || _isExpired() || !isOpen) {
       return false;
     }
     if (!_connectionSettings.isMatchingConnection(settings)) {