diff --git a/timer.asm b/timer.asm
index 1c8cad0..34629ee 100644
--- a/timer.asm
+++ b/timer.asm
@@ -127,6 +127,7 @@ UPDATE_CASH_DISPLAY PROC FAR
 UPDATE_CASH_DISPLAY_LOOP:
 
 	MOV AX, DS:DISPLAY_PASS
+
 	XOR DX, DX
 	DIV CX
 
@@ -854,6 +855,12 @@ M_TXN_IDLE:
 	TEST AH, AH
 	JNZ M_TXN_QTYBOOM
 
+	; Hard cap at inventory limit
+	XOR BH, BH
+	MOV BL, DS:TXN_ITEM
+	CMP AL, DS:ITEM_INVENTORY[BX]
+	JA M_TXN_QTYBOOM
+
 	ADD AL, BL
 
 	MOV DS:TXN_QTY, AL