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-rw-r--r--ice40/chipdb.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/ice40/chipdb.py b/ice40/chipdb.py
index fe25c1f1..37606b54 100644
--- a/ice40/chipdb.py
+++ b/ice40/chipdb.py
@@ -37,7 +37,7 @@ wire_names_r = dict()
wire_xy = dict()
num_tile_types = 5
-tile_sizes = {_: (0, 0) for _ in range(num_tile_types)}
+tile_sizes = {i: (0, 0) for i in range(num_tile_types)}
tile_bits = [[] for _ in range(num_tile_types)]
cbit_re = re.compile(r'B(\d+)\[(\d+)\]')