diff --git a/se/sics/mspsim/core/IOPort.java b/se/sics/mspsim/core/IOPort.java
index 0bcbb8f..cf7c23c 100644
--- a/se/sics/mspsim/core/IOPort.java
+++ b/se/sics/mspsim/core/IOPort.java
@@ -289,9 +289,9 @@ public class IOPort extends IOUnit {
             break;
         case IFG:
             if (DEBUG) {
-                log("Clearing IFlag: " + data);
+                log("Setting IFlag: " + data);
             }
-            ifg &= data;
+            ifg = data;
             updateIV();
             break;
         case IE: