diff --git a/src/uscxml/interpreter/InterpreterMonitor.h b/src/uscxml/interpreter/InterpreterMonitor.h
index 64c281c01..4502e34e0 100644
--- a/src/uscxml/interpreter/InterpreterMonitor.h
+++ b/src/uscxml/interpreter/InterpreterMonitor.h
@@ -25,6 +25,7 @@
 #include "uscxml/interpreter/Logging.h"
 #include "uscxml/debug/InterpreterIssue.h"
 
+#include <functional>
 #include <mutex>
 
 #define USCXML_MONITOR_CATCH(callback) \
@@ -211,7 +212,6 @@ class USCXML_API LambdaMonitor : public InterpreterMonitor {
 	                                    const std::string& stateName,
 	                                    const XERCESC_NS::DOMElement* state)> callback,
 	                bool after = false) {
-		_beforeEnteringState = callback;
 		if (after) {
 			_afterEnteringState = callback;
 		} else {