diff --git a/drd/scripts/measurement-functions b/drd/scripts/measurement-functions
index 1964d125d..f36b01fb1 100644
--- a/drd/scripts/measurement-functions
+++ b/drd/scripts/measurement-functions
@@ -40,7 +40,7 @@ function get_cache_size {
 ## Read a stream of numbers from stdin (one per line), and print the average
 #  and standard deviation.
 function avgstddev {
-  awk '{n++;m=NF;for(i=1;i<=NF;i++){sum[i]+=$i;sumsq[i]+=$i*$i}}END{for(i=1;i<=m;i++){d=sumsq[i]/n-sum[i]*sum[i]/n/n;printf "%.2f %.2f ",sum[i]/n,(d>0?sqrt(d):0.01)}}'
+  awk '{n++;m=NF;for(i=1;i<=NF;i++){sum[i]+=$i;sumsq[i]+=$i*$i}}END{for(i=1;i<=m;i++){d=sumsq[i]/n-sum[i]*sum[i]/n/n;printf "%.2f %.2f ",sum[i]/n,(d>=0.0001?sqrt(d):0.01)}}'
 }
 
 ## Query the virtual memory size for the last invocation of command $1 from