diff --git a/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiReferenceBuildOutput.cs b/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiReferenceBuildOutput.cs
index 04a06bfe6b9..c0cf003f929 100644
--- a/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiReferenceBuildOutput.cs
+++ b/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiReferenceBuildOutput.cs
@@ -269,7 +269,7 @@ public static List<ApiLanguageValuePair> GetSpecNames(string xref, string[] supp
         {
             if (specs != null && specs.Count > 0)
             {
-                return specs.Select(kv => new ApiLanguageValuePair() { Language = kv.Key, Value = GetSpecName(kv.Value) }).ToList();
+                return specs.Where(kv => supportedLanguages.Contains(kv.Key)).Select(kv => new ApiLanguageValuePair() { Language = kv.Key, Value = GetSpecName(kv.Value) }).ToList();
             }
             if (!string.IsNullOrEmpty(xref))
             {
diff --git a/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiSyntaxBuildOutput.cs b/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiSyntaxBuildOutput.cs
index a594b9c527b..51118eca725 100644
--- a/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiSyntaxBuildOutput.cs
+++ b/src/Microsoft.DocAsCode.Build.ManagedReference/BuildOutputs/ApiSyntaxBuildOutput.cs
@@ -77,8 +77,8 @@ private static List<ApiLanguageValuePair> GetContents(string content, string con
             if (string.IsNullOrEmpty(content) || supportedLanguages == null || supportedLanguages.Length == 0) return null;
 
             var result = new List<ApiLanguageValuePair>() { new ApiLanguageValuePair() { Language = supportedLanguages[0], Value = content } };
-            if (!string.IsNullOrEmpty(contentForCSharp)) result.Add(new ApiLanguageValuePair() { Language = "csharp", Value = contentForCSharp });
-            if (!string.IsNullOrEmpty(contentForVB)) result.Add(new ApiLanguageValuePair() { Language = "vb", Value = contentForVB });
+            if (!string.IsNullOrEmpty(contentForCSharp) && supportedLanguages.Contains("csharp")) result.Add(new ApiLanguageValuePair() { Language = "csharp", Value = contentForCSharp });
+            if (!string.IsNullOrEmpty(contentForVB) && supportedLanguages.Contains("vb")) result.Add(new ApiLanguageValuePair() { Language = "vb", Value = contentForVB });
             return result;
         }
     }