diff --git a/passes/cmds/splitcells.cc b/passes/cmds/splitcells.cc
index 833672b39..4a65cd110 100644
--- a/passes/cmds/splitcells.cc
+++ b/passes/cmds/splitcells.cc
@@ -189,8 +189,16 @@ struct SplitcellsWorker
 				IdString slice_name;
 				if (blast) {
 					// Strip existing '[' or '.' from cell name
-					size_t bracket_pos = base_name.find_first_of('[.');
+					size_t bracket_pos = base_name.find_first_of("[.");
+					bool strip_reg = false;
 					if (bracket_pos != std::string::npos) {
+
+						// Check if we will strip off _reg suffix
+						size_t reg_pos = base_name.find("_reg");
+						if (reg_pos != std::string::npos && reg_pos > bracket_pos) {
+							base_name = base_name.substr(0, reg_pos);
+							strip_reg = true;
+						}
 						base_name = base_name.substr(0, bracket_pos);
 					}
 
@@ -206,9 +214,9 @@ struct SplitcellsWorker
 							int bit_offset = user_index(slice_lsb);
 
 							// Concatenate struct attribute or wire index (ex: \Memory[0] -> [0]) to the bit offset
-							size_t bracket_pos = wire_name.find_first_of('[.');
+							size_t bracket_pos = wire_name.find_first_of("[.");
 							if (bracket_pos != std::string::npos) {
-									wire_indices = wire_name.substr(bracket_pos) + stringf(
+									wire_indices = wire_name.substr(bracket_pos) + (strip_reg ? "" : "_reg") + stringf(
 										"%c%d%c", format[0], bit_offset, format[1]);
 							} else { // no '[' or '.', so no concatenation using wire, use slice_lsb + name_lsb offset instead
 									wire_indices = stringf(