diff --git a/packaging/perftest/unipi/plot.sh b/packaging/perftest/unipi/plot.sh
index 5ffbafc..42b7229 100755
--- a/packaging/perftest/unipi/plot.sh
+++ b/packaging/perftest/unipi/plot.sh
@@ -64,7 +64,7 @@ set terminal png size $DIMS
 set output '$OUT_IMG'
 set title 'Concurrent'
 set style data histograms
-plot '$DAT' using 4:xtic(1)
+plot '$DAT' using 3:xtic(1)
 EOF
 
 rm "$DAT"