diff --git a/src/Microsoft.Health.Fhir.Api/Features/Filters/ValidateExportRequestFilterAttribute.cs b/src/Microsoft.Health.Fhir.Api/Features/Filters/ValidateExportRequestFilterAttribute.cs
index 8c18b3d2f1..b6c45c6b9a 100644
--- a/src/Microsoft.Health.Fhir.Api/Features/Filters/ValidateExportRequestFilterAttribute.cs
+++ b/src/Microsoft.Health.Fhir.Api/Features/Filters/ValidateExportRequestFilterAttribute.cs
@@ -63,7 +63,8 @@ public override void OnActionExecuting(ActionExecutingContext context)
 
             if (!context.HttpContext.Request.Headers.TryGetValue(HeaderNames.Accept, out var acceptHeaderValue) ||
                 acceptHeaderValue.Count != 1 ||
-                !string.Equals(acceptHeaderValue[0], KnownContentTypes.JsonContentType, StringComparison.OrdinalIgnoreCase))
+                !MediaTypeHeaderValue.TryParse(acceptHeaderValue[0], out var parsedMediaType) ||
+                !string.Equals(parsedMediaType.MediaType.Value, KnownContentTypes.JsonContentType, StringComparison.OrdinalIgnoreCase))
             {
                 throw new RequestNotValidException(string.Format(Api.Resources.UnsupportedHeaderValue, acceptHeaderValue.FirstOrDefault(), HeaderNames.Accept));
             }
diff --git a/src/Microsoft.Health.Fhir.Shared.Api.UnitTests/Features/Filters/ValidateExportRequestFilterAttributeTests.cs b/src/Microsoft.Health.Fhir.Shared.Api.UnitTests/Features/Filters/ValidateExportRequestFilterAttributeTests.cs
index af50e176a7..dfeb8be487 100644
--- a/src/Microsoft.Health.Fhir.Shared.Api.UnitTests/Features/Filters/ValidateExportRequestFilterAttributeTests.cs
+++ b/src/Microsoft.Health.Fhir.Shared.Api.UnitTests/Features/Filters/ValidateExportRequestFilterAttributeTests.cs
@@ -190,6 +190,21 @@ public void GivenARequestWithCorrectHeaderAndNoQueryParams_WhenGettingAnExportOp
             _filter.OnActionExecuting(context);
         }
 
+        [Theory]
+        [InlineData("application/fhir+json; charset=utf-8")]
+        [InlineData("application/fhir+json;charset=utf-8")]
+        [InlineData("application/fhir+json; charset=UTF-8")]
+        public void GivenARequestWithAcceptHeaderContainingMediaTypeParams_WhenGettingAnExportOperationRequest_ThenTheResultIsSuccessful(string acceptHeader)
+        {
+            // .NET HttpClient automatically appends "; charset=utf-8" to the Accept header.
+            // Validate that media type parameters do not cause the request to be rejected.
+            var context = CreateContext();
+            context.HttpContext.Request.Headers[HeaderNames.Accept] = acceptHeader;
+            context.HttpContext.Request.Headers[PreferHeaderName] = CorrectPreferHeaderValue;
+
+            _filter.OnActionExecuting(context);
+        }
+
         [Theory]
         [InlineData("respond-async", true)]
         [InlineData("respond-async,handling=strict", true)]