diff --git a/src/i2c/i2cslave.cxx b/src/i2c/i2cslave.cxx
index 567737c..af08889 100644
--- a/src/i2c/i2cslave.cxx
+++ b/src/i2c/i2cslave.cxx
@@ -44,6 +44,12 @@ I2CSlave::frequency(int hz)
     _hz = hz;
 }
 
+int
+I2CSlave::receive(void)
+{
+    return -1;
+}
+
 int
 I2CSlave::read(char *data, int length)
 {