diff --git a/Userland/Libraries/LibGfx/ICC/TagTypes.h b/Userland/Libraries/LibGfx/ICC/TagTypes.h
index b936e7e672..31b006d4de 100644
--- a/Userland/Libraries/LibGfx/ICC/TagTypes.h
+++ b/Userland/Libraries/LibGfx/ICC/TagTypes.h
@@ -762,6 +762,8 @@ public:
         : TagData(offset, size, Type)
         , m_text(move(text))
     {
+        for (u8 byte : text.bytes())
+            VERIFY(byte < 128);
     }
 
     // Guaranteed to be 7-bit ASCII.