diff --git a/src/cpp/ripple/ValidationCollection.cpp b/src/cpp/ripple/ValidationCollection.cpp
index 032ff4066..acb8c3157 100644
--- a/src/cpp/ripple/ValidationCollection.cpp
+++ b/src/cpp/ripple/ValidationCollection.cpp
@@ -309,6 +309,7 @@ void ValidationCollection::doWrite(Job&)
 	while (!mStaleValidations.empty())
 	{
 		std::vector<SerializedValidation::pointer> vector;
+		vector.reserve(512);
 		mStaleValidations.swap(vector);
 		sl.unlock();
 		{
diff --git a/src/cpp/ripple/ValidationCollection.h b/src/cpp/ripple/ValidationCollection.h
index 648ea173c..bcde16aa2 100644
--- a/src/cpp/ripple/ValidationCollection.h
+++ b/src/cpp/ripple/ValidationCollection.h
@@ -20,7 +20,7 @@ class ValidationCollection
 {
 protected:
 
-	boost::mutex mValidationLock;
+	boost::mutex													mValidationLock;
 	TaggedCache<uint256, ValidationSet>								mValidations;
 	boost::unordered_map<uint160, SerializedValidation::pointer> 	mCurrentValidations;
 	std::vector<SerializedValidation::pointer> 						mStaleValidations;
@@ -34,7 +34,8 @@ protected:
 	boost::shared_ptr<ValidationSet> findSet(const uint256& ledgerHash);
 
 public:
-	ValidationCollection() : mValidations("Validations", 128, 600), mWriting(false) { ; }
+	ValidationCollection() : mValidations("Validations", 128, 600), mWriting(false)
+	{ mStaleValidations.reserve(512); }
 
 	bool addValidation(SerializedValidation::ref);
 	ValidationSet getValidations(const uint256& ledger);