diff --git a/source/views/view_data_inspector.cpp b/source/views/view_data_inspector.cpp
index 95b67e96e..892910bd9 100644
--- a/source/views/view_data_inspector.cpp
+++ b/source/views/view_data_inspector.cpp
@@ -96,7 +96,8 @@ namespace hex {
             }
             #endif
 
-            this->m_cachedData.emplace_back("GUID", hex::format("{%08lX-%04hX-%04hX-%02hhX%02hhX-%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX}",
+            this->m_cachedData.emplace_back("GUID", hex::format("%s{%08lX-%04hX-%04hX-%02hhX%02hhX-%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX}",
+                (this->m_previewData.guid.data3 >> 12) <= 5 && ((this->m_previewData.guid.data4[0] >> 4) >= 8 || (this->m_previewData.guid.data4[0] >> 4) == 0) ? "" : "[INVALID] ",
                 hex::changeEndianess(this->m_previewData.guid.data1, this->m_endianess),
                 hex::changeEndianess(this->m_previewData.guid.data2, this->m_endianess),
                 hex::changeEndianess(this->m_previewData.guid.data3, this->m_endianess),