diff --git a/source/games/duke/src/2d_d.cpp b/source/games/duke/src/2d_d.cpp
index 5306f118e..aa2385358 100644
--- a/source/games/duke/src/2d_d.cpp
+++ b/source/games/duke/src/2d_d.cpp
@@ -894,7 +894,8 @@ public:
 					{
 						bonuscnt++;
 						S_PlaySound(SHOTGUN_COCK, CHAN_AUTO, CHANF_UI);
-						S_PlaySound(BONUS_SPEECH1 + (rand() & 3), CHAN_AUTO, CHANF_UI);
+						static const uint16_t speeches[] = { BONUS_SPEECH1, BONUS_SPEECH2, BONUS_SPEECH3, BONUS_SPEECH4};
+						S_PlaySound(speeches[(rand() & 3)], CHAN_AUTO, CHANF_UI);
 					}
 				case 1:
 				case 4: