diff --git a/core/vm/memory.go b/core/vm/memory.go
index 69c709531e..54bc2b2849 100644
--- a/core/vm/memory.go
+++ b/core/vm/memory.go
@@ -77,13 +77,13 @@ func (m *Memory) Set32(offset uint64, val *uint256.Int) {
 	val.PutUint256(m.store[offset:])
 }
 
-// Resize resizes the memory to size
+// Resize grows the memory to the requested size.
 func (m *Memory) Resize(size uint64) {
-	if uint64(m.Len()) < size {
-		if uint64(cap(m.store)) > size {
+	if uint64(len(m.store)) < size {
+		if uint64(cap(m.store)) >= size {
 			m.store = m.store[:size]
 		} else {
-			m.store = append(m.store, make([]byte, size-uint64(m.Len()))...)
+			m.store = append(m.store, make([]byte, size-uint64(len(m.store)))...)
 		}
 	}
 }