diff --git a/.github/workflows/continuous-integration.yaml b/.github/workflows/continuous-integration.yaml
index 36f3293..af8e0dc 100644
--- a/.github/workflows/continuous-integration.yaml
+++ b/.github/workflows/continuous-integration.yaml
@@ -43,7 +43,7 @@ jobs:
           test "$(port version)" = 'Version: ${{ matrix.version }}'
       - name: 'Validate transmitted MacPorts prefix'
         run: >-
-          test "${{ steps.macports.outputs.prefix }}" = '${{ matrix.prefix }}'
+          test "${{ steps.macports.outputs.prefix }}" = '/opt/${{ matrix.prefix }}'
       - name: 'Validate transmitted MacPorts version'
         run: >-
           test "${{ steps.macports.outputs.version }}" = '${{ matrix.version }}'
diff --git a/install_macports b/install_macports
index db288d5..2b789db 100755
--- a/install_macports
+++ b/install_macports
@@ -176,7 +176,7 @@ install_from_source()
 	make
 	sudo make install
     )
-    rm -Rf "${srcdir}"
+    sudo rm -Rf "${srcdir}"
 }
 
 install_ports()