diff --git a/get-modified-packages/get-modified-packages.sh b/get-modified-packages/get-modified-packages.sh
index 781fda77..0324bdf7 100755
--- a/get-modified-packages/get-modified-packages.sh
+++ b/get-modified-packages/get-modified-packages.sh
@@ -49,6 +49,21 @@ function find_package_dir() {
     return 1
 }
 
+# Function to check if the base ref SHA is in the commit history
+check_base_sha_in_history() {
+  git rev-list HEAD | grep -q "$(git rev-parse $base_sha)"
+}
+
+# Fetch the initial shallow clone depth
+depth=8
+
+# Loop to deepen the fetch until the base ref SHA is included,
+# deepening by a factor of 2 each time
+while ! check_base_sha_in_history; do
+  depth=$((depth * 2))
+  git fetch --deepen=$depth
+done
+
 # Find modified files from base branch
 modified_files=$(git diff --name-only "$base_sha"...HEAD)