diff --git a/src/soc/amd/cezanne/smihandler.c b/src/soc/amd/cezanne/smihandler.c
index 8f4e6d4ef6..61f5099362 100644
--- a/src/soc/amd/cezanne/smihandler.c
+++ b/src/soc/amd/cezanne/smihandler.c
@@ -105,11 +105,6 @@ static void fch_slp_typ_handler(void)
 	}
 }
 
-int southbridge_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 /*
  * Table of functions supported in the SMI handler.  Note that SMI source setup
  * in fch.c is unrelated to this list.
diff --git a/src/soc/amd/glinda/smihandler.c b/src/soc/amd/glinda/smihandler.c
index 9cc34b5b6b..9cf754a782 100644
--- a/src/soc/amd/glinda/smihandler.c
+++ b/src/soc/amd/glinda/smihandler.c
@@ -105,11 +105,6 @@ static void fch_slp_typ_handler(void)
 	}
 }
 
-int southbridge_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 /*
  * Table of functions supported in the SMI handler.  Note that SMI source setup
  * in fch.c is unrelated to this list.
diff --git a/src/soc/amd/mendocino/smihandler.c b/src/soc/amd/mendocino/smihandler.c
index 8e32b5d543..a973658def 100644
--- a/src/soc/amd/mendocino/smihandler.c
+++ b/src/soc/amd/mendocino/smihandler.c
@@ -105,11 +105,6 @@ static void fch_slp_typ_handler(void)
 	}
 }
 
-int southbridge_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 /*
  * Table of functions supported in the SMI handler.  Note that SMI source setup
  * in fch.c is unrelated to this list.
diff --git a/src/soc/amd/morgana/smihandler.c b/src/soc/amd/morgana/smihandler.c
index d04f9a3f45..f7519684b4 100644
--- a/src/soc/amd/morgana/smihandler.c
+++ b/src/soc/amd/morgana/smihandler.c
@@ -105,11 +105,6 @@ static void fch_slp_typ_handler(void)
 	}
 }
 
-int southbridge_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 /*
  * Table of functions supported in the SMI handler.  Note that SMI source setup
  * in fch.c is unrelated to this list.
diff --git a/src/soc/amd/picasso/smihandler.c b/src/soc/amd/picasso/smihandler.c
index 9568fce73e..247a159df5 100644
--- a/src/soc/amd/picasso/smihandler.c
+++ b/src/soc/amd/picasso/smihandler.c
@@ -107,11 +107,6 @@ static void fch_slp_typ_handler(void)
 	}
 }
 
-int southbridge_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 /*
  * Table of functions supported in the SMI handler.  Note that SMI source setup
  * in fch.c is unrelated to this list.
diff --git a/src/soc/amd/stoneyridge/smihandler.c b/src/soc/amd/stoneyridge/smihandler.c
index 7ba9bb8853..a8521c5bda 100644
--- a/src/soc/amd/stoneyridge/smihandler.c
+++ b/src/soc/amd/stoneyridge/smihandler.c
@@ -129,11 +129,6 @@ static void fch_slp_typ_handler(void)
 	}
 }
 
-int southbridge_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 /*
  * Table of functions supported in the SMI handler.  Note that SMI source setup
  * in southbridge.c is unrelated to this list.
diff --git a/src/southbridge/amd/pi/hudson/smihandler.c b/src/southbridge/amd/pi/hudson/smihandler.c
index a942c24ada..429d07a4c7 100644
--- a/src/southbridge/amd/pi/hudson/smihandler.c
+++ b/src/southbridge/amd/pi/hudson/smihandler.c
@@ -43,11 +43,6 @@ static void hudson_apmc_smi_handler(void)
 	mainboard_smi_apmc(cmd);
 }
 
-int southbridge_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 static void process_smi_sci(void)
 {
 	const uint32_t status = smi_read32(0x10);