diff --git a/bucket/rustup-msvc.json b/bucket/rustup-msvc.json
index bae237d18a..3eddc3f120 100644
--- a/bucket/rustup-msvc.json
+++ b/bucket/rustup-msvc.json
@@ -25,7 +25,7 @@
             "[Environment]::SetEnvironmentVariable('CARGO_HOME', \"$persist_dir\\.cargo\", 'Process')",
             "[Environment]::SetEnvironmentVariable('RUSTUP_HOME', \"$persist_dir\\.rustup\", 'Process')",
             "$host_arch = if ($architecture -eq '64bit') {'x86_64'} else {'i686'}",
-            "Invoke-ExternalCommand -Path \"$dir\\rustup-init.exe\" -Args \"-y --no-modify-path --default-host $host_arch-pc-windows-msvc\" | Out-Null"
+            "Invoke-ExternalCommand -Path \"$dir\\rustup-init.exe\" -Args @('-y', '--no-modify-path', '--default-host', \"$host_arch-pc-windows-msvc\") | Out-Null"
         ]
     },
     "env_add_path": ".cargo\\bin",
diff --git a/bucket/rustup.json b/bucket/rustup.json
index c628dee8b9..b133a61105 100644
--- a/bucket/rustup.json
+++ b/bucket/rustup.json
@@ -19,7 +19,7 @@
             "[Environment]::SetEnvironmentVariable('CARGO_HOME', \"$persist_dir\\.cargo\", 'Process')",
             "[Environment]::SetEnvironmentVariable('RUSTUP_HOME', \"$persist_dir\\.rustup\", 'Process')",
             "$host_arch = if ($architecture -eq '64bit') {'x86_64'} else {'i686'}",
-            "Invoke-ExternalCommand -Path \"$dir\\rustup-init.exe\" -Args \"-y --no-modify-path --default-host $host_arch-pc-windows-gnu\" | Out-Null"
+            "Invoke-ExternalCommand -Path \"$dir\\rustup-init.exe\" -Args @('-y', '--no-modify-path', '--default-host', \"$host_arch-pc-windows-gnu\") | Out-Null"
         ]
     },
     "env_add_path": ".cargo\\bin",