diff --git a/src/VirtualClient/VirtualClient.Actions/Lzbench/lzbenchexecutor.sh b/src/VirtualClient/VirtualClient.Actions/Lzbench/lzbenchexecutor.sh
index a2dcd274a6..79473bacf6 100644
--- a/src/VirtualClient/VirtualClient.Actions/Lzbench/lzbenchexecutor.sh
+++ b/src/VirtualClient/VirtualClient.Actions/Lzbench/lzbenchexecutor.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
 
 echo $1
-./lzbench $1 > results-summary.csv
+# Use stdbuf to force line-buffered stdout so CSV data is flushed incrementally
+# to disk rather than held in a full-buffer until process exit. Without this,
+# a timeout-based kill loses all buffered output (especially on ARM64).
+stdbuf -oL ./lzbench $1 > results-summary.csv