diff --git a/re2/fuzzing/re2_fuzzer.cc b/re2/fuzzing/re2_fuzzer.cc
index e0aa96a..d3cd145 100644
--- a/re2/fuzzing/re2_fuzzer.cc
+++ b/re2/fuzzing/re2_fuzzer.cc
@@ -56,7 +56,7 @@
 
 // Entry point for libFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  if (size == 0 || size > 1024)
+  if (size == 0 || size > 512)
     return 0;
 
   // Crudely limit the use of \p and \P.