diff --git a/libs/libpcf/src/io/read_csv_io_pin_table.h b/libs/libpcf/src/io/read_csv_io_pin_table.h
index acf3473a5..50f5e3d2a 100644
--- a/libs/libpcf/src/io/read_csv_io_pin_table.h
+++ b/libs/libpcf/src/io/read_csv_io_pin_table.h
@@ -18,9 +18,9 @@ namespace openfpga {
 enum class e_pin_table_direction_convention {
   EXPLICIT = 0,
   QUICKLOGIC,
-  NUM_PIN_DIRECTION_CONVENTION
+  NUM_TYPES
 };
-constexpr std::array<const char*, NUM_PIN_DIRECTION_CONVENTION> PIN_TABLE_DIRECTION_CONVENTION_STRING = {{"explicit", "quicklogic"}}; //String versions of side orientations
+constexpr std::array<const char*, static_cast<size_t>(e_pin_table_direction_convention::NUM_TYPES)> PIN_TABLE_DIRECTION_CONVENTION_STRING = {{"explicit", "quicklogic"}}; //String versions of side orientations
 
 IoPinTable read_csv_io_pin_table(const char* fname, const e_pin_table_direction_convention& pin_dir_convention);