1 files changed, 6 insertions, 0 deletions
diff --git a/internal/casino/credits.go b/internal/casino/credits.go
index 8b7cb7a..631a4bc 100644
--- a/internal/casino/credits.go
+++ b/internal/casino/credits.go
@@ -47,6 +47,12 @@ func MulPayout(amount int, multiplier float64) (int, error) {
 		return MaxCredits, fmt.Errorf("payout overflow: %d * %v exceeds %d", amount, multiplier, MaxCredits)
 	}
 	payout := int(math.Floor(float64(amount) * multiplier))
+	if payout == 0 && multiplier > 0 {
+		// A positive stake on a winning outcome must never pay nothing: a
+		// fractional multiplier (e.g. a 5% baccarat commission) at a 1-credit
+		// bet floors to zero, turning a win into a total loss.
+		payout = 1
+	}
 	if payout > MaxCredits {
 		return MaxCredits, fmt.Errorf("payout overflow: %d * %v exceeds %d", amount, multiplier, MaxCredits)
 	}