diff --git a/extensions/ctl/src/nsUnicodeToTIS620.cpp b/extensions/ctl/src/nsUnicodeToTIS620.cpp
index 460372d09e91..f3914069cf0b 100644
--- a/extensions/ctl/src/nsUnicodeToTIS620.cpp
+++ b/extensions/ctl/src/nsUnicodeToTIS620.cpp
@@ -191,7 +191,7 @@ NS_IMETHODIMP nsUnicodeToTIS620::Convert(const PRUnichar * input,
 
   // Cleanup Run Info;
   aPtr = txtRuns.head;
-  for (int i = 0; i < txtRuns.numRuns; i++) {
+  for (i = 0; i < txtRuns.numRuns; i++) {
     aTmpPtr = aPtr;
     aPtr = aPtr->next;
     delete aTmpPtr;