diff --git a/ai.asm b/ai.asm
index 4a6e736..c4ac11f 100644
--- a/ai.asm
+++ b/ai.asm
@@ -263,6 +263,7 @@ UseIt
     lda #99
     sta Energy,x
     jsr MaxForceCalculate
+    ; and SFX
     mva #sfx_battery sfx_effect
     ldy #7
     jsr PauseYFrames    ; wait 14 frames (Battery SFX)
@@ -303,6 +304,10 @@ NoBatteries
     sta ActiveDefenceWeapon,x
     lda DefensiveEnergy,y
     sta ShieldEnergy,x
+    ; and SFX
+    mva #sfx_auto_defense sfx_effect
+    ldy #7
+    jsr PauseYFrames    ; wait 14 frames (Defense SFX)
 DefensiveInUse
 NoUseDefensive
 DefensiveStatusLine
diff --git a/scorch.bin b/scorch.bin
index f461144..09df846 100644
Binary files a/scorch.bin and b/scorch.bin differ
diff --git a/scorch.xex b/scorch.xex
index 45c1b94..d2c55b4 100644
Binary files a/scorch.xex and b/scorch.xex differ
diff --git a/scorchC64.prg b/scorchC64.prg
index 916abbf..54ad6cf 100644
Binary files a/scorchC64.prg and b/scorchC64.prg differ