diff --git a/configure.ac b/configure.ac
index 6a4bf32..ddd94c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -167,7 +167,7 @@ EXPRESS_LIBS="${EXPRESS_LIBS} ${EXP_LIBS}"
 
 AC_FUNC_ALLOCA
 
-AC_CHECK_FUNCS([getuid geteuid])
+AC_CHECK_FUNCS([getuid geteuid mkstemps])
 
 AC_CONFIG_FILES([
 Makefile