diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 92cdb2df7285..3f685beba384 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2655,6 +2655,13 @@ int cmd_stat(int argc, const char **argv)
 
 	stat_config.aggr_mode = opt_aggr_mode_to_aggr_mode(&opt_mode);
 
+	if (stat_config.csv_sep && stat_config.json_output) {
+		fprintf(stderr, "cannot use both --field-separator and --json-output\n");
+		parse_options_usage(stat_usage, stat_options, "x", 1);
+		parse_options_usage(NULL, stat_options, "j", 1);
+		goto out;
+	}
+
 	if (stat_config.csv_sep) {
 		stat_config.csv_output = true;
 		if (!strcmp(stat_config.csv_sep, "\\t"))
diff --git a/tools/perf/tests/shell/stat.sh b/tools/perf/tests/shell/stat.sh
index 1e17bee026bd..649de1166fed 100755
--- a/tools/perf/tests/shell/stat.sh
+++ b/tools/perf/tests/shell/stat.sh
@@ -535,6 +535,17 @@ test_stat_delay() {
   echo "stat -D test [Success]"
 }
 
+test_csv_json_fail() {
+  echo "stat -x <sep> -j test"
+  if perf stat -x , -j true > /dev/null 2>&1
+  then
+    echo "stat -x <sep> -j test [Failed - command should have errored]"
+    err=1
+  else
+    echo "stat -x <sep> -j test [Success]"
+  fi
+}
+
 test_default_stat
 test_null_stat
 test_offline_cpu_stat
@@ -551,6 +562,7 @@ test_stat_detailed
 test_stat_repeat
 test_stat_pid
 test_stat_delay
+test_csv_json_fail
 
 cleanup
 exit $err