diff --git a/common/fuzzing/proto_to_carbon.cpp b/common/fuzzing/proto_to_carbon.cpp
index 60878aad9633..d53c6cd29045 100644
--- a/common/fuzzing/proto_to_carbon.cpp
+++ b/common/fuzzing/proto_to_carbon.cpp
@@ -45,7 +45,7 @@ static auto IdentifierToCarbon(std::string_view s, llvm::raw_ostream& out)
 
 static auto StringLiteralToCarbon(std::string_view s, llvm::raw_ostream& out) {
   out << '"';
-  out.write_escaped(s);
+  out.write_escaped(s, /*UseHexEscapes=*/true);
   out << '"';
 }
 
diff --git a/explorer/testdata/string/hex.carbon b/explorer/testdata/string/hex.carbon
index 3fd0cc18acea..173edd6a8619 100644
--- a/explorer/testdata/string/hex.carbon
+++ b/explorer/testdata/string/hex.carbon
@@ -12,12 +12,12 @@
 package ExplorerTest api;
 
 fn CompareStr(s: String) -> i32 {
-  if (s == "str;") {
+  if (s == "str;\x07") {
     return 0;
   }
   return 1;
 }
 
 fn Main() -> i32 {
-  return CompareStr("\x73\x74\x72\x3B");
+  return CompareStr("\x73\x74\x72\x3B\x07");
 }