diff --git a/internal/config/testdata/telegraf-agent.toml b/internal/config/testdata/telegraf-agent.toml
index 5ede47016..8bde486dd 100644
--- a/internal/config/testdata/telegraf-agent.toml
+++ b/internal/config/testdata/telegraf-agent.toml
@@ -107,7 +107,7 @@
 # Read flattened metrics from one or more commands that output JSON to stdout
 [[inputs.exec]]
   # the command to run
-  command = "/usr/bin/mycollector --foo=bar"
+  commands = ["/usr/bin/mycollector --foo=bar"]
   name_suffix = "_mycollector"
 
 # Read metrics of haproxy, via socket or csv stats page