diff --git a/passes/techmap/liberty_cache.h b/passes/techmap/liberty_cache.h
index 0498cf8a1..baab8f8be 100644
--- a/passes/techmap/liberty_cache.h
+++ b/passes/techmap/liberty_cache.h
@@ -50,7 +50,6 @@ inline std::string convert_liberty_files_to_merged_scl(const std::vector<std::st
 
 	hash_input += dont_use_args;
 	// Include build datetime so caches from other builds are not reused
-	hash_input += "|";
 	hash_input += yosys_build_datetime_str;
 	unsigned int hash = 0;