1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/yosys.h b/kernel/yosys.h
index e90dcc46..f9c1848e 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -63,6 +63,7 @@
 YOSYS_NAMESPACE_BEGIN
 
 namespace RTLIL {
+	struct IdString;
 	struct SigSpec;
 	struct Wire;
 	struct Cell;