diff --git a/install-mpsd-software-environment.py b/install-mpsd-software-environment.py
index 8df8df45ef2ddc064761d7f8a5f7d02b7d65e836..642e13cf397c34f13c94b7cf0309da4ea5d2dfdf 100755
--- a/install-mpsd-software-environment.py
+++ b/install-mpsd-software-environment.py
@@ -249,7 +249,7 @@ def install_environment(
             print(f"Installing toolchain {toolchain} to {toolchain_dir}")
             install_log_file = (
                 config_vars["build_log_file"]
-                .replace("_toolchain_", f"_{toolchain}_")
+                .replace("_toolchains_", f"_{toolchain}_")
                 .replace("_mpsd_spack_ver_", f"_{mpsd_release}_")
             )
             subprocess.run(