diff --git a/se/sics/mspsim/core/MSP430Core.java b/se/sics/mspsim/core/MSP430Core.java
index efb9b7f..6c04c69 100644
--- a/se/sics/mspsim/core/MSP430Core.java
+++ b/se/sics/mspsim/core/MSP430Core.java
@@ -324,6 +324,12 @@ public class MSP430Core implements MSP430Constants {
   public void reset() {
     resetIOUnits();
     reg[PC] = memory[0xfffe] +  (memory[0xffff] << 8);
+    for (int i = 0, n = 16; i < n; i++) {
+      interruptSource[i] = null;
+    }
+    servicedInterruptUnit = null;
+    servicedInterrupt = -1;
+    interruptMax = -1;
   }
 
   // Indicate that we have an interrupt now!