1 files changed, 2 insertions, 1 deletions
diff --git a/test/std/re/re.results/re.results.acc/begin_end.pass.cpp b/test/std/re/re.results/re.results.acc/begin_end.pass.cpp
index a5ed051265cc..85b5134266dc 100644
--- a/test/std/re/re.results/re.results.acc/begin_end.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/begin_end.pass.cpp
@@ -16,6 +16,7 @@
 
 #include <regex>
 #include <cassert>
+#include <cstddef>
 #include "test_macros.h"
 
 void
@@ -28,7 +29,7 @@ test()
     std::match_results<const char*>::const_iterator i = m.begin();
     std::match_results<const char*>::const_iterator e = m.end();
 
-    assert(e - i == m.size());
+    assert(static_cast<std::size_t>(e - i) == m.size());
     for (int j = 0; i != e; ++i, ++j)
         assert(*i == m[j]);
 }