diff --git a/Userland/Libraries/LibGfx/ICC/BinaryFormat.h b/Userland/Libraries/LibGfx/ICC/BinaryFormat.h
index f78525412f..15fd82256e 100644
--- a/Userland/Libraries/LibGfx/ICC/BinaryFormat.h
+++ b/Userland/Libraries/LibGfx/ICC/BinaryFormat.h
@@ -149,4 +149,12 @@ struct MultiLocalizedUnicodeRawRecord {
 };
 static_assert(AssertSize<MultiLocalizedUnicodeRawRecord, 12>());
 
+// Table 84 — viewingConditionsType encoding
+struct ViewingConditionsHeader {
+    XYZNumber unnormalized_ciexyz_values_for_illuminant; // "(in which Y is in cd/m2)"
+    XYZNumber unnormalized_ciexyz_values_for_surround;   // "(in which Y is in cd/m2)"
+    BigEndian<MeasurementTagData::StandardIlluminant> illuminant_type;
+};
+static_assert(AssertSize<ViewingConditionsHeader, 28>());
+
 }
diff --git a/Userland/Libraries/LibGfx/ICC/TagTypes.cpp b/Userland/Libraries/LibGfx/ICC/TagTypes.cpp
index f8fb83dc6e..c777e3166a 100644
--- a/Userland/Libraries/LibGfx/ICC/TagTypes.cpp
+++ b/Userland/Libraries/LibGfx/ICC/TagTypes.cpp
@@ -1175,14 +1175,6 @@ ErrorOr<NonnullRefPtr<ViewingConditionsTagData>> ViewingConditionsTagData::from_
     VERIFY(tag_type(bytes) == Type);
     TRY(check_reserved(bytes));
 
-    // Table 84 — viewingConditionsType encoding
-    struct ViewingConditionsHeader {
-        XYZNumber unnormalized_ciexyz_values_for_illuminant; // "(in which Y is in cd/m2)"
-        XYZNumber unnormalized_ciexyz_values_for_surround;   // "(in which Y is in cd/m2)"
-        BigEndian<MeasurementTagData::StandardIlluminant> illuminant_type;
-    };
-    static_assert(AssertSize<ViewingConditionsHeader, 28>());
-
     if (bytes.size() < 2 * sizeof(u32) + sizeof(ViewingConditionsHeader))
         return Error::from_string_literal("ICC::Profile: viewingConditionsType has not enough data");