diff --git a/dev-proxy-plugins/RequestLogs/OpenApiSpecGeneratorPlugin.cs b/dev-proxy-plugins/RequestLogs/OpenApiSpecGeneratorPlugin.cs
index e861f2e7..35d7f36a 100644
--- a/dev-proxy-plugins/RequestLogs/OpenApiSpecGeneratorPlugin.cs
+++ b/dev-proxy-plugins/RequestLogs/OpenApiSpecGeneratorPlugin.cs
@@ -583,6 +583,12 @@ private void SetResponseFromSession(OpenApiOperation operation, Response respons
                     continue;
                 }
 
+                if (openApiResponse.Headers.ContainsKey(header.Name))
+                {
+                    _logger?.LogDebug("    Header {headerName} already exists in response", header.Name);
+                    continue;
+                }
+
                 openApiResponse.Headers.Add(header.Name, new OpenApiHeader
                 {
                     Schema = new OpenApiSchema { Type = "string" }