diff --git a/sandboxed_api/bazel/filewrapper.cc b/sandboxed_api/bazel/filewrapper.cc
index 1f97680..8b3f212 100644
--- a/sandboxed_api/bazel/filewrapper.cc
+++ b/sandboxed_api/bazel/filewrapper.cc
@@ -36,7 +36,7 @@ void FWriteCEscapedC(int c, FILE* out) {
       4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 4, 4, 2, 4, 4,  // \t, \n, \r
       4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
       1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // "
-      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // '0'..'9'
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,  // '0'..'9'
       1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 'A'..'O'
       1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1,  // 'P'..'Z', '\'
       1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 'a'..'o'
@@ -71,13 +71,10 @@ void FWriteCEscapedC(int c, FILE* out) {
         fputc('t', out);
         break;
       case '\"':
-        fputc('\"', out);
-        break;
       case '\'':
-        fputc('\'', out);
-        break;
       case '\\':
-        fputc('\\', out);
+      case '?':
+        fputc(c, out);
         break;
     }
   } else {