diff --git a/test/benchmarks/fs/fio_test.go b/test/benchmarks/fs/fio_test.go
index 44546e6bc..202805afa 100644
--- a/test/benchmarks/fs/fio_test.go
+++ b/test/benchmarks/fs/fio_test.go
@@ -126,7 +126,7 @@ func BenchmarkFio(b *testing.B) {
 
 				// For reads, we need a file to read so make one inside the container.
 				if strings.Contains(tc.Test, "read") {
-					fallocateCmd := fmt.Sprintf("fallocate -l %dK %s", tc.Size, outfile)
+					fallocateCmd := fmt.Sprintf("fallocate -l %dM %s", tc.Size, outfile)
 					if out, err := container.Exec(ctx, dockerutil.ExecOpts{},
 						strings.Split(fallocateCmd, " ")...); err != nil {
 						b.Fatalf("failed to create readable file on mount: %v, %s", err, out)