diff --git a/Interdata/id16_cpu.c b/Interdata/id16_cpu.c
index 4352a892..c1daa8f6 100644
--- a/Interdata/id16_cpu.c
+++ b/Interdata/id16_cpu.c
@@ -594,7 +594,7 @@ reason = 0;
 
 while (reason == 0) {                                   /* loop until halted */
     uint32 dev, drom, inc, lim, opnd;
-    uint32 op, r1, r1p1, r2, ea, oPC;
+    uint32 op, r1, r1p1, r2, ea = 0, oPC;
     uint32 rslt, t, map;
     uint32 ir1, ir2, ityp;
     int32 sr, st;