diff --git a/CHANGES b/CHANGES
index fc30744935..b0b1d5e83d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,9 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.5.1
 
+  *) mod_proxy_hcheck: Re-enable workers in standard ERROR state. PR 66302.
+     [Alessandro Cavaliere <alessandro.cavalier7 unibo.it>]
+
   *) mod_proxy_hcheck: Detect AJP/CPING support correctly. PR 66300.
      [Alessandro Cavaliere <alessandro.cavalier7 unibo.it>]
 
diff --git a/modules/proxy/mod_proxy.h b/modules/proxy/mod_proxy.h
index c15d0785c3..0df3dc2801 100644
--- a/modules/proxy/mod_proxy.h
+++ b/modules/proxy/mod_proxy.h
@@ -360,6 +360,8 @@ PROXY_WORKER_HC_FAIL )
 
 #define PROXY_WORKER_IS_HCFAILED(f)   ( (f)->s->status &  PROXY_WORKER_HC_FAIL )
 
+#define PROXY_WORKER_IS_ERROR(f)   ( (f)->s->status &  PROXY_WORKER_IN_ERROR )
+
 #define PROXY_WORKER_IS(f, b)   ( (f)->s->status & (b) )
 
 /* default worker retry timeout in seconds */
diff --git a/modules/proxy/mod_proxy_hcheck.c b/modules/proxy/mod_proxy_hcheck.c
index dd2740e81c..b99f3c1ae3 100644
--- a/modules/proxy/mod_proxy_hcheck.c
+++ b/modules/proxy/mod_proxy_hcheck.c
@@ -927,7 +927,7 @@ static void * APR_THREAD_FUNC hc_check(apr_thread_t *thread, void *b)
                          (int)hc->s->method);
     }
     /* what state are we in ? */
-    else if (PROXY_WORKER_IS_HCFAILED(worker)) {
+    else if (PROXY_WORKER_IS_HCFAILED(worker) || PROXY_WORKER_IS_ERROR(worker)) {
         if (rv == APR_SUCCESS) {
             worker->s->pcount += 1;
             if (worker->s->pcount >= worker->s->passes) {