diff --git a/sources/SilkTouch/SilkTouch/Mods/MixKhronosData.cs b/sources/SilkTouch/SilkTouch/Mods/MixKhronosData.cs
index 3a914d0ee7..7eb0500cb6 100644
--- a/sources/SilkTouch/SilkTouch/Mods/MixKhronosData.cs
+++ b/sources/SilkTouch/SilkTouch/Mods/MixKhronosData.cs
@@ -2278,7 +2278,7 @@ var group in (groupName is null ? Enumerable.Empty<string>() : [groupName])
             }
 
             // Some enum groups don't have members, meaning that the code above won't catch them
-            if (groupName != null && !data.Groups.ContainsKey(groupName))
+            if (groupName != null && !IsUngroupable(groupName) && !data.Groups.ContainsKey(groupName))
             {
                 data.Groups[groupName] = new EnumGroup(
                     groupName,
diff --git a/tests/SilkTouch/SilkTouch/Khronos/MixKhronosDataTests.EnumGroupRegression.cl.xml.verified.txt b/tests/SilkTouch/SilkTouch/Khronos/MixKhronosDataTests.EnumGroupRegression.cl.xml.verified.txt
index f621042656..6935be9c20 100644
--- a/tests/SilkTouch/SilkTouch/Khronos/MixKhronosDataTests.EnumGroupRegression.cl.xml.verified.txt
+++ b/tests/SilkTouch/SilkTouch/Khronos/MixKhronosDataTests.EnumGroupRegression.cl.xml.verified.txt
@@ -15,6 +15,8 @@ Added Group: cl_arm_svm_alloc_flags
 Existing Group: cl_command_queue_properties
     Added: CL_QUEUE_RESERVED_QCOM
 
+Added Group: cl_compiler_mode_altera
+
 Added Group: cl_device_command_buffer_capabilities_khr 
     Added: CL_COMMAND_BUFFER_CAPABILITY_DEVICE_SIDE_ENQUEUE_KHR
     Added: CL_COMMAND_BUFFER_CAPABILITY_KERNEL_PRINTF_KHR