diff --git a/ipmid.H b/ipmid.H
index 679392d..f465072 100644
--- a/ipmid.H
+++ b/ipmid.H
@@ -12,6 +12,8 @@
 
 // Plugin libraries need to _end_ with .so
 #define IPMI_PLUGIN_EXTN ".so"
+// Plugin libraries can be versioned with suffix .so.*
+#define IPMI_PLUGIN_SONAME_EXTN ".so."
 
 // The BT FIFO in the AST2400 can only handle 64 bytes.  
 // Can only allow 63 because the BT interface still 
@@ -22,4 +24,4 @@
 
 int set_sensor_dbus_state_s(uint8_t , const char *, const char *);
 int set_sensor_dbus_state_y(uint8_t , const char *, const uint8_t);
-#endif
\ No newline at end of file
+#endif