diff --git a/src/soc/amd/cezanne/smihandler.c b/src/soc/amd/cezanne/smihandler.c
index b941293286..46164e4d84 100644
--- a/src/soc/amd/cezanne/smihandler.c
+++ b/src/soc/amd/cezanne/smihandler.c
@@ -1,6 +1,12 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #include <amdblocks/smm.h>
+#include <cpu/x86/smm.h>
+
+int southbridge_io_trap_handler(int smif)
+{
+	return 0;
+}
 
 void *get_smi_source_handler(int source)
 {