diff --git a/configure.ac b/configure.ac
index f73fe56b..2b9633a6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -407,8 +407,9 @@ dnl Checks for functions and headers
 
 AS_IF([test "x$EMSCRIPTEN" = "x"],[
   AC_CHECK_FUNCS([arc4random arc4random_buf])
+  AC_CHECK_FUNCS([mlock mprotect explicit_bzero])
 ])
-AC_CHECK_FUNCS([mlock mprotect explicit_bzero posix_memalign])
+AC_CHECK_FUNCS([posix_memalign])
 
 AC_SUBST([LIBTOOL_EXTRA_FLAGS])