diff --git a/benchstat/table.go b/benchstat/table.go
index ef938d1..cd8a027 100644
--- a/benchstat/table.go
+++ b/benchstat/table.go
@@ -99,12 +99,16 @@
 					} else if testerr != nil {
 						row.Note = fmt.Sprintf("(%s)", testerr)
 					} else if pval < alpha {
-						pct := ((new.Mean / old.Mean) - 1.0) * 100.0
-						row.Delta = fmt.Sprintf("%+.2f%%", pct)
-						if pct < 0 == (table.Metric != "speed") { // smaller is better, except speeds
-							row.Change = +1
+						if new.Mean == old.Mean {
+							row.Delta = "0.00%"
 						} else {
-							row.Change = -1
+							pct := ((new.Mean / old.Mean) - 1.0) * 100.0
+							row.Delta = fmt.Sprintf("%+.2f%%", pct)
+							if pct < 0 == (table.Metric != "speed") { // smaller is better, except speeds
+								row.Change = +1
+							} else {
+								row.Change = -1
+							}
 						}
 					}
 					if row.Note == "" && pval != -1 {
diff --git a/cmd/benchstat/main_test.go b/cmd/benchstat/main_test.go
index 4653ae0..4a50020 100644
--- a/cmd/benchstat/main_test.go
+++ b/cmd/benchstat/main_test.go
@@ -39,6 +39,7 @@
 	check(t, "packagesold", "packagesold.txt")
 	check(t, "packages", "packagesold.txt", "packagesnew.txt")
 	check(t, "units", "units-old.txt", "units-new.txt")
+	check(t, "zero", "-delta-test=none", "zero-old.txt", "zero-new.txt")
 }
 
 func check(t *testing.T, name string, files ...string) {
diff --git a/cmd/benchstat/testdata/zero-new.txt b/cmd/benchstat/testdata/zero-new.txt
new file mode 100644
index 0000000..d855b6b
--- /dev/null
+++ b/cmd/benchstat/testdata/zero-new.txt
@@ -0,0 +1,4 @@
+pkg: synthetic
+note: test benchstat printing of zeros
+
+BenchmarkImperceptible 1 1234567890 a-bytes 171717171716 b-bytes 99999930 c-bytes
diff --git a/cmd/benchstat/testdata/zero-old.txt b/cmd/benchstat/testdata/zero-old.txt
new file mode 100644
index 0000000..9df0d06
--- /dev/null
+++ b/cmd/benchstat/testdata/zero-old.txt
@@ -0,0 +1,4 @@
+pkg: synthetic
+note: test benchstat printing of zeros
+
+BenchmarkImperceptible 1 1234567890 a-bytes 171717171717 b-bytes 99999929 c-bytes
diff --git a/cmd/benchstat/testdata/zero.golden b/cmd/benchstat/testdata/zero.golden
new file mode 100644
index 0000000..7c6170f
--- /dev/null
+++ b/cmd/benchstat/testdata/zero.golden
@@ -0,0 +1,8 @@
+name           old a-bytes  new a-bytes  delta
+Imperceptible  1.23GB ± 0%  1.23GB ± 0%   0.00%
+
+name           old b-bytes  new b-bytes  delta
+Imperceptible   172GB ± 0%   172GB ± 0%  -0.00%
+
+name           old c-bytes  new c-bytes  delta
+Imperceptible   100MB ± 0%   100MB ± 0%  +0.00%