diff --git a/ci/binary_size_treemap.sh b/ci/binary_size_treemap.sh
index b144c4b..64ca0fa 100755
--- a/ci/binary_size_treemap.sh
+++ b/ci/binary_size_treemap.sh
@@ -27,4 +27,9 @@
 # Run the binary size script from the buildroot directory so the treemap path
 # navigation will start from there.
 cd "$ENGINE_BUILDROOT"
-python3 third_party/dart/runtime/third_party/binary_size/src/run_binary_size_analysis.py --library "$INPUT_PATH" --destdir "$DEST_DIR" --addr2line-binary "$ADDR2LINE"
+RUN_BINARY_SIZE_ANALYSIS="third_party/dart/third_party/binary_size/src/run_binary_size_analysis.py"
+if [[ ! -f "$RUN_BINARY_SIZE_ANALYSIS" ]]; then
+  # Fallback to the old path until https://dart-review.googlesource.com/c/sdk/+/332963 rolls to Flutter Engine.
+  RUN_BINARY_SIZE_ANALYSIS="third_party/dart/runtime/third_party/binary_size/src/run_binary_size_analysis.py"
+fi
+python3 "$RUN_BINARY_SIZE_ANALYSIS" --library "$INPUT_PATH" --destdir "$DEST_DIR" --addr2line-binary "$ADDR2LINE"