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-rw-r--r--backends/aiger/xaiger.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index 19e6c8369..632a5c8d5 100644
--- a/backends/aiger/xaiger.cc
+++ b/backends/aiger/xaiger.cc
@@ -843,7 +843,7 @@ struct XAigerWriter
write_r_buffer(ff_bits.size());
int mergeability_class = 1;
for (auto cell : ff_bits)
- write_r_buffer(mergeability_class);
+ write_r_buffer(mergeability_class++);
f << "r";
buffer_str = r_buffer.str();