diff --git a/passes/techmap/abc.cc b/passes/techmap/abc.cc
index 02d908bbd..855fdadb7 100644
--- a/passes/techmap/abc.cc
+++ b/passes/techmap/abc.cc
@@ -1685,7 +1685,7 @@ struct AbcPass : public Pass {
 		bool abc_dress = false;
 		vector<int> lut_costs;
 		markgroups = false;
-  	std::string map_src;
+		std::string map_src;
 		map_mux4 = false;
 		map_mux8 = false;
 		map_mux16 = false;