diff --git a/Testing/nsdata.m b/Testing/nsdata.m
index f03ebc9a8..bc41b55b8 100644
--- a/Testing/nsdata.m
+++ b/Testing/nsdata.m
@@ -11,6 +11,8 @@ main()
   id o;
   id pool;
 
+  [NSAutoreleasePool enableDoubleReleaseCheck:YES];
+
   pool = [[NSAutoreleasePool alloc] init];
 
   d = [NSData dataWithContentsOfMappedFile:@"nsdata.m"];
@@ -80,7 +82,6 @@ main()
   o = [a decodeObject];
   printf("Decoded data from archive - length %d\n", [o length]);
   [a release];
-  [o release];
 
   [d setCapacity: 2000000];
   printf("Set capacity of shared memory item to %d\n", [d capacity]);
diff --git a/Testing/nshost.m b/Testing/nshost.m
index b326603f9..437ac273f 100644
--- a/Testing/nshost.m
+++ b/Testing/nshost.m
@@ -26,6 +26,7 @@ main ()
   NSHost*	n;
   NSAutoreleasePool	*arp = [NSAutoreleasePool new];
 
+  [NSAutoreleasePool enableDoubleReleaseCheck:YES];
   c = [NSHost currentHost];
   displayHost(c);
   n = [NSHost hostWithName:[c name]];
@@ -37,7 +38,6 @@ main ()
 
   [NSHost setHostCacheEnabled:NO];
 
-  [n release];
   n = [NSHost hostWithName:[c name]];
   displayHost(n);
   printf("c:%lx, n:%lx, a:%lx\n", c, n, a);