diff --git a/apps/examples/Make.defs b/apps/examples/Make.defs
index 1c61513844..3d95ccb16d 100644
--- a/apps/examples/Make.defs
+++ b/apps/examples/Make.defs
@@ -106,6 +106,10 @@ ifeq ($(CONFIG_EXAMPLES_MM),y)
 CONFIGURED_APPS += examples/mm
 endif
 
+ifeq ($(CONFIG_EXAMPLES_MODBUS),y)
+CONFIGURED_APPS += examples/modbus
+endif
+
 ifeq ($(CONFIG_EXAMPLES_MOUNT),y)
 CONFIGURED_APPS += examples/mount
 endif
diff --git a/apps/modbus/mb.c b/apps/modbus/mb.c
index 209b1274ca..8417d12749 100644
--- a/apps/modbus/mb.c
+++ b/apps/modbus/mb.c
@@ -399,10 +399,12 @@ eMBPoll( void )
                     ucMBFrame[usLength++] = ( uint8_t )( ucFunctionCode | MB_FUNC_ERROR );
                     ucMBFrame[usLength++] = eException;
                 }
+#ifdef CONFIG_MB_ASCII_ENABLED
                 if( ( eMBCurrentMode == MB_ASCII ) && CONFIG_MB_ASCII_TIMEOUT_WAIT_BEFORE_SEND_MS )
                 {
                     vMBPortTimersDelay( CONFIG_MB_ASCII_TIMEOUT_WAIT_BEFORE_SEND_MS );
-                }                
+                }
+#endif
                 eStatus = peMBFrameSendCur( ucMBAddress, ucMBFrame, usLength );
             }
             break;