diff --git a/panda/src/downloader/httpChannel.cxx b/panda/src/downloader/httpChannel.cxx
index af44780713..eaec9ebdc7 100644
--- a/panda/src/downloader/httpChannel.cxx
+++ b/panda/src/downloader/httpChannel.cxx
@@ -190,7 +190,7 @@ close_read_file(istream *stream) const {
     // the stream pointer does not call the appropriate global delete
     // function; instead apparently calling the system delete
     // function.  So we call the delete function by hand instead.
-#ifndef NDEBUG
+#ifndef USE_MEMORY_NOWRAPPERS
     stream->~istream();
     (*global_operator_delete)(stream);
 #else
diff --git a/panda/src/express/virtualFileMount.cxx b/panda/src/express/virtualFileMount.cxx
index 5176198b08..768efa2a25 100644
--- a/panda/src/express/virtualFileMount.cxx
+++ b/panda/src/express/virtualFileMount.cxx
@@ -46,7 +46,7 @@ close_read_file(istream *stream) const {
     // the stream pointer does not call the appropriate global delete
     // function; instead apparently calling the system delete
     // function.  So we call the delete function by hand instead.
-#ifndef NDEBUG
+#ifndef USE_MEMORY_NOWRAPPERS
     stream->~istream();
     (*global_operator_delete)(stream);
 #else
diff --git a/panda/src/express/virtualFileSystem.cxx b/panda/src/express/virtualFileSystem.cxx
index db2fa9d8bc..359c674eb5 100644
--- a/panda/src/express/virtualFileSystem.cxx
+++ b/panda/src/express/virtualFileSystem.cxx
@@ -605,12 +605,12 @@ close_read_file(istream *stream) const {
     // the stream pointer does not call the appropriate global delete
     // function; instead apparently calling the system delete
     // function.  So we call the delete function by hand instead.
-    #ifndef NDEBUG
+#ifndef USE_MEMORY_NOWRAPPERS
     stream->~istream();
     (*global_operator_delete)(stream);
-    #else
+#else
     delete stream;
-    #endif
+#endif
   }
 }