diff --git a/src/Testcontainers.CosmosDb/CosmosDbBuilder.cs b/src/Testcontainers.CosmosDb/CosmosDbBuilder.cs
index b25393ab4..d40116625 100644
--- a/src/Testcontainers.CosmosDb/CosmosDbBuilder.cs
+++ b/src/Testcontainers.CosmosDb/CosmosDbBuilder.cs
@@ -45,7 +45,7 @@ protected override CosmosDbBuilder Init()
         return base.Init()
             .WithImage(CosmosDbImage)
             .WithPortBinding(CosmosDbPort, true)
-            .WithWaitStrategy(Wait.ForUnixContainer().UntilMessageIsLogged("Started\\r?\\n"));
+            .WithWaitStrategy(Wait.ForUnixContainer().AddCustomWaitStrategy(new WaitUntil()));
     }
 
     /// <inheritdoc />
@@ -65,4 +65,33 @@ protected override CosmosDbBuilder Merge(CosmosDbConfiguration oldValue, CosmosD
     {
         return new CosmosDbBuilder(new CosmosDbConfiguration(oldValue, newValue));
     }
+
+    /// <inheritdoc cref="IWaitUntil" />
+    private sealed class WaitUntil : IWaitUntil
+    {
+        /// <inheritdoc />
+        public async Task<bool> UntilAsync(IContainer container)
+        {
+            // CosmosDB's preconfigured HTTP client will redirect the request to the container.
+            const string requestUri = "https://localhost/_explorer/emulator.pem";
+
+            var httpClient = ((CosmosDbContainer)container).HttpClient;
+
+            try
+            {
+                using var httpResponse = await httpClient.GetAsync(requestUri)
+                    .ConfigureAwait(false);
+
+                return httpResponse.IsSuccessStatusCode;
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+            finally
+            {
+                httpClient.Dispose();
+            }
+        }
+    }
 }
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