diff --git a/tests/archive/archivetest.cpp b/tests/archive/archivetest.cpp
index c92cb7390d..e70751bf80 100644
--- a/tests/archive/archivetest.cpp
+++ b/tests/archive/archivetest.cpp
@@ -1200,9 +1200,10 @@ void CorruptionTestCase::runTest()
     CreateArchive(out);
     TestInputStream in(out, 0);
     wxFileOffset len = in.GetLength();
+    int pos, size;
 
     // try flipping one byte in the archive
-    for (int pos = 0; pos < len; pos++) {
+    for (pos = 0; pos < len; pos++) {
         char n = in[pos];
         in[pos] = ~n;
         ExtractArchive(in);
@@ -1211,7 +1212,7 @@ void CorruptionTestCase::runTest()
     }
 
     // try zeroing one byte in the archive
-    for (int pos = 0; pos < len; pos++) {
+    for (pos = 0; pos < len; pos++) {
         char n = in[pos];
         in[pos] = 0;
         ExtractArchive(in);
@@ -1220,7 +1221,7 @@ void CorruptionTestCase::runTest()
     }
 
     // try chopping the archive off
-    for (int size = 1; size <= len; size++) {
+    for (size = 1; size <= len; size++) {
         in.Chop(size);
         ExtractArchive(in);
         in.Rewind();