---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure.ac b/configure.ac
index bacb7ac5..cf33d79a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -220,6 +220,8 @@ if (test "${enable_external_ell}" = "yes"); then
 		AC_MSG_ERROR(Embedded Linux library >= 0.12 is required))
 	AC_SUBST(ELL_CFLAGS)
 	AC_SUBST(ELL_LIBS)
+else
+	AC_CHECK_FUNCS(explicit_bzero)
 fi
 AM_CONDITIONAL(EXTERNAL_ELL, test "${enable_external_ell}" = "yes")
 
-- 
2.20.1