diff --git a/configure.ac b/configure.ac
index e7c71857..760cdc6f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -686,7 +686,7 @@ dnl Checks for functions and headers
 
 AS_IF([test "x$EMSCRIPTEN" = "x"],[
   AC_CHECK_FUNCS([arc4random arc4random_buf])
-  AC_CHECK_FUNCS([mmap mlock madvise mprotect explicit_bzero nanosleep])
+  AC_CHECK_FUNCS([mmap mlock madvise mprotect memset_s explicit_bzero nanosleep])
 ])
 AC_CHECK_FUNCS([posix_memalign getpid])