diff --git a/deploy.py b/deploy.py
index b8ba61c3dd66ed3b6805e7c48c5cedc08532e26f..2848924dceb32c85a33ef2c04455dd3f88061b3d 100755
--- a/deploy.py
+++ b/deploy.py
@@ -310,13 +310,13 @@ class OpenSKInstaller:
       # Need to update
       rustup_install = ["rustup"]
       if self.args.verbose_build:
-        rustup_install.extend(["--verbose"])
+        rustup_install.append("--verbose")
       rustup_install.extend(["install", target_toolchain_fullstring])
       self.checked_command(rustup_install)
 
     rustup_target = ["rustup"]
     if self.args.verbose_build:
-      rustup_target.extend(["--verbose"])
+      rustup_target.append("--verbose")
     rustup_target.extend(
         ["target", "add", SUPPORTED_BOARDS[self.args.board].arch])
     self.checked_command(rustup_target)
@@ -368,7 +368,7 @@ class OpenSKInstaller:
     if is_example:
       command.extend(["--example", self.args.application])
     if self.args.verbose_build:
-      command.extend(["--verbose"])
+      command.append("--verbose")
     self.checked_command(command, env=env)
     app_path = os.path.join("target", props.arch, "release")
     if is_example:
@@ -406,7 +406,7 @@ class OpenSKInstaller:
         "elf2tab", package_parameter, self.args.application, "-o", tab_filename
     ]
     if self.args.verbose_build:
-      elf2tab_args.extend(["--verbose"])
+      elf2tab_args.append("--verbose")
     for arch, app_file in binaries.items():
       dest_file = os.path.join(self.tab_folder, "{}.elf".format(arch))
       shutil.copyfile(app_file, dest_file)