diff --git a/scripting/engine.cpp b/scripting/engine.cpp
index 65b97991adc..dc088fbd86c 100644
--- a/scripting/engine.cpp
+++ b/scripting/engine.cpp
@@ -34,7 +34,7 @@ namespace mongo {
         _numScopes--;
     }
 
-    ScriptEngine::ScriptEngine(){
+    ScriptEngine::ScriptEngine() : _scopeInitCallback() {
     }
 
     ScriptEngine::~ScriptEngine(){