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-rw-r--r--fpga_interchange/arch.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/fpga_interchange/arch.cc b/fpga_interchange/arch.cc
index 41659861..58fa3c85 100644
--- a/fpga_interchange/arch.cc
+++ b/fpga_interchange/arch.cc
@@ -161,7 +161,7 @@ Arch::Arch(ArchArgs args) : args(args)
for (const TileTypeInfoPOD &tile_type : chip_info->tile_types) {
max_tag_count = std::max(max_tag_count, tile_type.tags.size());
- auto &type_definition = constraints.definitions[tile_type_index];
+ auto &type_definition = constraints.definitions[tile_type_index++];
for (const ConstraintTagPOD &tag : tile_type.tags) {
type_definition.emplace_back();
auto &definition = type_definition.back();