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-rw-r--r--ethchain/vm.go2
1 files changed, 2 insertions, 0 deletions
diff --git a/ethchain/vm.go b/ethchain/vm.go
index 3b58d6106..56456fdab 100644
--- a/ethchain/vm.go
+++ b/ethchain/vm.go
@@ -182,7 +182,9 @@ func (vm *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
require(2)
newMemSize = stack.Peek().Uint64() + 32
case MLOAD:
+ require(1)
+ newMemSize = stack.Peek().Uint64() + 32
case MSTORE8:
require(2)
newMemSize = stack.Peek().Uint64() + 1