diff --git a/test/unicode.c b/test/unicode.c
index 6d04653c8292840a8646fb92163e21f4b34bab0b..9081eeec89140ddc6fdc0ce618e19b91fa50e543 100644
--- a/test/unicode.c
+++ b/test/unicode.c
@@ -21,6 +21,13 @@ int main() {
   ASSERT(12354, u'あ');
   ASSERT(62307, u'🍣');
 
+  ASSERT(4, sizeof(U'\0'));
+  ASSERT(1, U'\xffffffff'>>31);
+  ASSERT(97, U'a');
+  ASSERT(946, U'β');
+  ASSERT(12354, U'あ');
+  ASSERT(127843, U'🍣');
+
   printf("OK\n");
   return 0;
 }
diff --git a/tokenize.c b/tokenize.c
index 5905f91fe7d32a244ec228e31a7c9c9c7faf7bce..783e0fd7eb6f5ac7f4d74896dd21a61c2c530d44 100644
--- a/tokenize.c
+++ b/tokenize.c
@@ -470,6 +470,13 @@ Token *tokenize(File *file) {
       continue;
     }
 
+    // UTF-32 character literal
+    if (startswith(p, "U'")) {
+      cur = read_char_literal(cur, p + 1, ty_uint);
+      p += cur->len + 1;
+      continue;
+    }
+
     // Identifier or keyword
     if (is_ident1(*p)) {
       char *q = p++;