diff --git a/lib/util/sudo_debug.c b/lib/util/sudo_debug.c
index 464fc299d..07a5e4e76 100644
--- a/lib/util/sudo_debug.c
+++ b/lib/util/sudo_debug.c
@@ -979,6 +979,14 @@ sudo_debug_get_fds_v1(unsigned char **fds)
     return sudo_debug_max_fd;
 }
 #else /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
+int
+sudo_debug_register_v2(const char *program, const char *const subsystems[],
+    unsigned int ids[], struct sudo_conf_debug_file_list *debug_files,
+    int minfd)
+{
+    return SUDO_DEBUG_INSTANCE_INITIALIZER;
+}
+
 int
 sudo_debug_register_v1(const char *program, const char *const subsystems[],
     unsigned int ids[], struct sudo_conf_debug_file_list *debug_files)