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-rw-r--r--passes/opt/opt_muxtree.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/passes/opt/opt_muxtree.cc b/passes/opt/opt_muxtree.cc
index 9d622d6a6..5602b5eea 100644
--- a/passes/opt/opt_muxtree.cc
+++ b/passes/opt/opt_muxtree.cc
@@ -27,6 +27,8 @@
#include <stdio.h>
#include <set>
+using RTLIL::id2cstr;
+
struct OptMuxtreeWorker
{
RTLIL::Design *design;