1 files changed, 2 insertions, 0 deletions
diff --git a/stm.go b/stm.go
index fcd1f02..8934455 100644
--- a/stm.go
+++ b/stm.go
@@ -135,6 +135,8 @@ func (tx *Tx) Get(v *Var) interface{} {
 		return val
 	}
 	// Otherwise, record and return its current value.
+	globalLock.Lock()
+	defer globalLock.Unlock()
 	tx.reads[v] = v.val
 	return v.val
 }