diff --git a/moses/FeatureVector.cpp b/moses/FeatureVector.cpp
index 45a198c84..f92bcedae 100644
--- a/moses/FeatureVector.cpp
+++ b/moses/FeatureVector.cpp
@@ -175,7 +175,7 @@ void FVector::resize(size_t newsize)
 
 void FVector::clear()
 {
-  m_coreFeatures.resize(0);
+  m_coreFeatures.resize(m_coreFeatures.size(), 0);
   m_features.clear();
 }