diff --git a/client/driver/executor/executor.go b/client/driver/executor/executor.go
index 7ab5bc96e..7c383adfd 100644
--- a/client/driver/executor/executor.go
+++ b/client/driver/executor/executor.go
@@ -112,7 +112,7 @@ func NewExecutor(logger *log.Logger) Executor {
 // LaunchCmd launches a process and returns it's state. It also configures an
 // applies isolation on certain platforms.
 func (e *UniversalExecutor) LaunchCmd(command *ExecCommand, ctx *ExecutorContext) (*ProcessState, error) {
-	e.logger.Printf("[DEBUG] executor: launching command %v %v", command.Cmd, strings.Join(command.Args, ""))
+	e.logger.Printf("[DEBUG] executor: launching command %v %v", command.Cmd, strings.Join(command.Args, " "))
 
 	e.ctx = ctx