--- oftpd-0.3.7/src/daemon_assert.c
+++ oftpd-0.3.7/src/daemon_assert.c
@@ -3,6 +3,7 @@
 #include <pthread.h>
 #include <syslog.h>
 #include <stdio.h>
+#include <unistd.h>
 
 #ifndef NDEBUG
 void daemon_assert_fail(const char *assertion,
@@ -13,7 +13,7 @@
 {
     syslog(LOG_CRIT, "%s:%d: %s: %s", file, line, function, assertion);
     fprintf(stderr, "%s:%d: %s: %s\n", file, line, function, assertion);
-    exit(1);
+    _exit(1);
 }
 #endif
 
