diff --git a/lib/base/log.c b/lib/base/log.c
index 3797826d7..c3170e140 100644
--- a/lib/base/log.c
+++ b/lib/base/log.c
@@ -448,7 +448,7 @@ heim_addlog_dest(heim_context context, heim_log_facility *f, const char *orig)
 heim_error_code
 heim_openlog(heim_context context,
              const char *program,
-             const char **specs,
+             const char *const *specs,
              heim_log_facility **fac)
 {
     heim_error_code ret;