diff --git a/samples/vboxwrapper/floppyio.cpp b/samples/vboxwrapper/floppyio.cpp
index f1d13d9fda..b66dde010b 100644
--- a/samples/vboxwrapper/floppyio.cpp
+++ b/samples/vboxwrapper/floppyio.cpp
@@ -72,6 +72,15 @@ static FloppyIOException   __FloppyIOExceptionSingleton;
 //
 
 FloppyIO::FloppyIO(const char * filename, int flags) {
+  // initialize class members
+  ofsInput = 0;
+  szInput = 0;
+  ofsOutput = 0;
+  szOutput = 0;
+  ofsCtrlByteIn = 0;
+  ofsCtrlByteOut = 0;
+  synchronized = false;
+  syncTimeout = 0;
   // Clear error flag
   this->error = 0;
   
diff --git a/samples/vboxwrapper/vbox_common.cpp b/samples/vboxwrapper/vbox_common.cpp
index 37d374efa2..ecdae303d4 100644
--- a/samples/vboxwrapper/vbox_common.cpp
+++ b/samples/vboxwrapper/vbox_common.cpp
@@ -119,6 +119,7 @@ VBOX_BASE::VBOX_BASE() : VBOX_JOB() {
     register_only = false;
     rd_host_port = 0;
     headless = true;
+    log_pointer = 0;
     vm_pid = 0;
     vboxsvc_pid = 0;