diff --git a/hw/tosa.c b/hw/tosa.c
index b932efc..4c463e6 100644
--- a/hw/tosa.c
+++ b/hw/tosa.c
@@ -121,9 +121,10 @@
     return 0;
 }
 
-static void tosa_ssp_init(SSISlave *dev)
+static int tosa_ssp_init(SSISlave *dev)
 {
     /* Nothing to do.  */
+    return 0;
 }
 
 typedef struct {
@@ -180,9 +181,10 @@
     return -1;
 }
 
-static void tosa_dac_init(i2c_slave *i2c)
+static int tosa_dac_init(i2c_slave *i2c)
 {
     /* Nothing to do.  */
+    return 0;
 }
 
 static void tosa_tg_init(PXA2xxState *cpu)