1 files changed, 3 insertions, 1 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/buildtool/SkyframeBuilder.java b/src/main/java/com/google/devtools/build/lib/buildtool/SkyframeBuilder.java
index 0ab5e8059c..fd91a9358b 100644
--- a/src/main/java/com/google/devtools/build/lib/buildtool/SkyframeBuilder.java
+++ b/src/main/java/com/google/devtools/build/lib/buildtool/SkyframeBuilder.java
@@ -66,6 +66,8 @@ import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
 
+import javax.annotation.Nullable;
+
 /**
  * A {@link Builder} implementation driven by Skyframe.
  */
@@ -103,7 +105,7 @@ public class SkyframeBuilder implements Builder {
       Executor executor,
       Set<ConfiguredTarget> builtTargets,
       boolean explain,
-      Range<Long> lastExecutionTimeRange)
+      @Nullable Range<Long> lastExecutionTimeRange)
       throws BuildFailedException, AbruptExitException, TestExecException, InterruptedException {
     skyframeExecutor.prepareExecution(checkOutputFiles, lastExecutionTimeRange);
     skyframeExecutor.setFileCache(fileCache);