diff --git a/c2rust-ast-exporter/src/AstExporter.cpp b/c2rust-ast-exporter/src/AstExporter.cpp
index a81634ce65..cf77b71166 100644
--- a/c2rust-ast-exporter/src/AstExporter.cpp
+++ b/c2rust-ast-exporter/src/AstExporter.cpp
@@ -656,6 +656,7 @@ class TypeEncoder final : public TypeVisitor<TypeEncoder> {
         VisitQualType(t);
     }
 
+    #if CLANG_VERSION_MAJOR < 22
     void VisitElaboratedType(const ElaboratedType *T) {
         auto t = T->desugar();
         auto qt = encodeQualType(t);
@@ -664,6 +665,7 @@ class TypeEncoder final : public TypeVisitor<TypeEncoder> {
 
         VisitQualType(t);
     }
+    #endif
 
     void VisitDecayedType(const DecayedType *T) {
         auto t = T->desugar();
@@ -673,6 +675,16 @@ class TypeEncoder final : public TypeVisitor<TypeEncoder> {
 
         VisitQualType(t);
     }
+
+    #if CLANG_VERSION_MAJOR >= 22
+    void VisitPredefinedSugarType(const clang::PredefinedSugarType *T) {
+        auto t = T->desugar();
+        auto k = T->getKind();
+        encodeType(T, TagPredefinedSugarType,
+                   [k](CborEncoder *local) { cbor_encode_uint(local, uint64_t(k)); });
+        VisitQualType(t);
+    }
+    #endif
 };
 
 class TranslateASTVisitor final
@@ -2224,8 +2236,6 @@ class TranslateASTVisitor final
         auto recordAlignment = 0;
         auto byteSize = 0;
 
-        auto t = D->getTypeForDecl();
-
         auto loc = D->getSourceRange();
         std::vector<void *> childIds;
         if (def) {
@@ -2305,8 +2315,6 @@ class TranslateASTVisitor final
         // They are used in actual code and accepted by compilers, so we cannot
         // exit early via code like `if (!D->isCompleteDefinition()) return true;`.
 
-        auto t = D->getTypeForDecl();
-
         std::vector<void *> childIds;
         for (auto x : D->enumerators()) {
             childIds.push_back(x->getCanonicalDecl());
diff --git a/c2rust-ast-exporter/src/ast_tags.hpp b/c2rust-ast-exporter/src/ast_tags.hpp
index 3fc9160393..30a59bea93 100644
--- a/c2rust-ast-exporter/src/ast_tags.hpp
+++ b/c2rust-ast-exporter/src/ast_tags.hpp
@@ -151,6 +151,7 @@ enum TypeTag {
 
     TagFloat128,
     TagAtomicType,
+    TagPredefinedSugarType,
 };
 
 enum StringTypeTag {
diff --git a/c2rust-transpile/src/c_ast/conversion.rs b/c2rust-transpile/src/c_ast/conversion.rs
index 59cc7bcfa8..282c6f1cb0 100644
--- a/c2rust-transpile/src/c_ast/conversion.rs
+++ b/c2rust-transpile/src/c_ast/conversion.rs
@@ -813,6 +813,21 @@ impl ConversionContext {
                     self.processed_nodes.insert(new_id, expected_ty);
                 }
 
+                TypeTag::TagPredefinedSugarType => {
+                    let kind = from_value(ty_node.extras[0].clone())
+                        .expect("Predefined sugar type kind not found");
+
+                    // See `clang::PredefinedSugarKind`.
+                    let predef_sugar_ty = match kind {
+                        0 => CTypeKind::Size,
+                        1 => CTypeKind::SSize,
+                        2 => CTypeKind::PtrDiff,
+                        _ => panic!("Predefined sugar type kind {kind} not known"),
+                    };
+                    self.add_type(new_id, not_located(predef_sugar_ty));
+                    self.processed_nodes.insert(new_id, expected_ty);
+                }
+
                 TypeTag::TagEnumType if expected_ty & OTHER_TYPE != 0 => {
                     let decl = from_value(ty_node.extras[0].clone()).expect("Enum decl not found");
                     let decl_new = CDeclId(self.visit_node_type(decl, ENUM_DECL));