diff --git a/common/rfb/Security.cxx b/common/rfb/Security.cxx
index e51c891..b5f361e 100644
--- a/common/rfb/Security.cxx
+++ b/common/rfb/Security.cxx
@@ -52,6 +52,10 @@
 
 static LogWriter vlog("Security");
 
+Security::Security()
+{
+}
+
 Security::Security(StringParameter &secTypes)
 {
   char *secTypesStr;
diff --git a/common/rfb/Security.h b/common/rfb/Security.h
index 832735a..196eb42 100644
--- a/common/rfb/Security.h
+++ b/common/rfb/Security.h
@@ -65,6 +65,7 @@
     /*
      * Create Security instance.
      */
+    Security();
     Security(StringParameter &secTypes);
 
     /*