diff --git a/docs/ReleaseNotes.md b/docs/ReleaseNotes.md
index aae40a9c6..0edb93c95 100644
--- a/docs/ReleaseNotes.md
+++ b/docs/ReleaseNotes.md
@@ -9,6 +9,7 @@ Current package versions:
 ## Unreleased
 
 - Fix logic inversion with `ARGREP NOCASE`, add `IsReversed` to simplify ordering, and support `ARINFO FULL`. ([#3087 by @mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/3087))
+- Avoid sentinel issues if `ROLE` unavailable; fix #3064 ([#3088 by @mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/3088))
 
 ## 2.13.10
 
diff --git a/src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs b/src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs
index 61b36b014..35276347d 100644
--- a/src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs
+++ b/src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs
@@ -240,10 +240,28 @@ public ConnectionMultiplexer GetSentinelMasterConnection(ConfigurationOptions co
 
             // verify role is primary according to:
             // https://redis.io/topics/sentinel-clients
-            if (connection.GetServer(newPrimaryEndPoint)?.Role()?.Value == RedisLiterals.master)
+            bool isPrimary;
+            var server = connection.GetServer(newPrimaryEndPoint);
+            // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+            if (server is { })
             {
-                success = true;
-                break;
+                try
+                {
+                    isPrimary = connection.CommandMap.IsAvailable(RedisCommand.ROLE)
+                        ? server.Role()?.Value == RedisLiterals.master
+                        : !server.IsReplica;
+                }
+                catch
+                {
+                    // fallback if ROLE unavailable but not declared; see #3064
+                    isPrimary = !server.IsReplica;
+                }
+
+                if (isPrimary)
+                {
+                    success = true;
+                    break;
+                }
             }
 
             Thread.Sleep(100);