diff --git a/tools/rw-heatmaps/rw-benchmark.sh b/tools/rw-heatmaps/rw-benchmark.sh
index 66d89cdd8a59..b30831fc72c4 100755
--- a/tools/rw-heatmaps/rw-benchmark.sh
+++ b/tools/rw-heatmaps/rw-benchmark.sh
@@ -2,7 +2,7 @@
 
 #set -x
 
-RATIO_LIST="1/128 1/8 1/4 1/2 2/1 4/1 8/1 128/1"
+RATIO_LIST="${RATIO_LIST:-1/128 1/8 1/4 1/2 2/1 4/1 8/1 128/1}"
 VALUE_SIZE_POWER_RANGE="8 14"
 CONN_CLI_COUNT_POWER_RANGE="5 11"
 REPEAT_COUNT=5