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-rw-r--r--ext/unicorn_http/common_field_optimization.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/unicorn_http/common_field_optimization.h b/ext/unicorn_http/common_field_optimization.h
index a714368..850fb90 100644
--- a/ext/unicorn_http/common_field_optimization.h
+++ b/ext/unicorn_http/common_field_optimization.h
@@ -103,7 +103,8 @@ static VALUE uncommon_field(const char *field, size_t flen)
   VALUE f = rb_str_new(NULL, HTTP_PREFIX_LEN + flen);
   memcpy(RSTRING_PTR(f), HTTP_PREFIX, HTTP_PREFIX_LEN);
   memcpy(RSTRING_PTR(f) + HTTP_PREFIX_LEN, field, flen);
-  assert(*(RSTRING_PTR(f) + RSTRING_LEN(f)) == '\0'); /* paranoia */
+  assert(*(RSTRING_PTR(f) + RSTRING_LEN(f)) == '\0' &&
+         "string didn't end with \\0"); /* paranoia */
   return rb_obj_freeze(f);
 }