diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27a6fcae9..14ca8098a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,11 +8,11 @@ jobs:
 
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-20.04, ubuntu-22.04]
+        os: [macos-latest, ubuntu-22.04, ubuntu-24.04]
         crypto: [auto]
         include:
           - crypto: nettle
-            os: ubuntu-20.04
+            os: ubuntu-22.04
         
 
     steps:
@@ -24,7 +24,11 @@ jobs:
 
     - name: "setup macos build environment"
       if: ${{ startsWith(matrix.os, 'macos') }}
-      run: brew install protobuf automake
+      run: |
+        brew install protobuf automake
+        F=$(pkg-config --cflags protobuf |  sed 's/-I\/opt\/homebrew/-isystem \/opt\/homebrew/g')
+        echo "protobuf_CFLAGS=$F" >> $GITHUB_ENV
+
 
     - name: "generate build scripts"
       run: ./autogen.sh
diff --git a/src/terminal/terminalframebuffer.h b/src/terminal/terminalframebuffer.h
index 9039d4e7f..075be53d7 100644
--- a/src/terminal/terminalframebuffer.h
+++ b/src/terminal/terminalframebuffer.h
@@ -428,7 +428,7 @@ class Framebuffer
       row = ds.get_cursor_row();
     row_pointer& mutable_row = rows.at( row );
     // If the row is shared, copy it.
-    if ( !mutable_row.unique() ) {
+    if ( mutable_row.use_count() > 1 ) {
       mutable_row = std::make_shared<Row>( *mutable_row );
     }
     return mutable_row.get();