diff --git a/_codeql_detected_source_root b/_codeql_detected_source_root
new file mode 120000
index 0000000..945c9b4
--- /dev/null
+++ b/_codeql_detected_source_root
@@ -0,0 +1 @@
+.
\ No newline at end of file
diff --git a/include/boost/openmethod/policies/minimal_perfect_hash.hpp b/include/boost/openmethod/policies/minimal_perfect_hash.hpp
index b9e93a0..7a693ca 100644
--- a/include/boost/openmethod/policies/minimal_perfect_hash.hpp
+++ b/include/boost/openmethod/policies/minimal_perfect_hash.hpp
@@ -313,6 +313,7 @@ void minimal_perfect_hash::fn<Registry>::initialize(
 
                 // Check if this displacement works for all keys in group
                 std::vector<std::size_t> positions;
+                positions.reserve(groups[g].size());
                 bool valid = true;
                 for (auto key : groups[g]) {
                     auto pilot = (mult * reinterpret_cast<detail::uintptr>(key)) >> shift;