diff --git a/src/go/pt-galera-log-explainer/internal.go b/src/go/pt-galera-log-explainer/internal.go
index 35549c42..c3b065de 100644
--- a/src/go/pt-galera-log-explainer/internal.go
+++ b/src/go/pt-galera-log-explainer/internal.go
@@ -130,7 +130,7 @@ func execGrepAndIterate(path, compiledRegex string, stdout chan<- string) error
 		logger.Warn().Msg("On Darwin systems, use 'pt-galera-log-explainer --grep-cmd=ggrep' as it requires grep v3")
 	}
 
-	cmd := exec.Command(CLI.GrepCmd, CLI.GrepArgs, compiledRegex, path)
+	cmd := exec.Command(CLI.GrepCmd, "-P", compiledRegex, path)
 
 	out, _ := cmd.StdoutPipe()
 	defer out.Close()
diff --git a/src/go/pt-galera-log-explainer/main.go b/src/go/pt-galera-log-explainer/main.go
index bf879636..37e2479b 100644
--- a/src/go/pt-galera-log-explainer/main.go
+++ b/src/go/pt-galera-log-explainer/main.go
@@ -45,8 +45,7 @@ var CLI struct {
 
 	Version kong.VersionFlag
 
-	GrepCmd  string `help:"'grep' command path. Could need to be set to 'ggrep' for darwin systems" default:"grep"`
-	GrepArgs string `help:"'grep' arguments. perl regexp (-P) is necessary. -o will break the tool" default:"-P"`
+	GrepCmd string `help:"'grep' command path. Could need to be set to 'ggrep' for darwin systems" default:"grep"`
 }
 
 func main() {