diff --git a/configure.ac b/configure.ac
index 2d08102..4880b58 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,16 +20,16 @@ AC_CONFIG_FILES([
     resources/packages/i945-thinkpads-install-utilities/Makefile
 ])
 
-AC_SUBST([GUIX_BUILD_CORES], [])
+AC_SUBST([GUIX_BUILD_MAX_CORES], [])
 
-# --with-guix-build-cores
-AC_ARG_WITH([guix-build-cores],
-    [AS_HELP_STRING([--with-guix-build-cores=N],
+# --with-guix-build-max-cores
+AC_ARG_WITH([guix-build-max-cores],
+    [AS_HELP_STRING([--with-guix-build-max-cores=N],
                   [Force guix build the use of up to N CPU cores for the build.
                    Lowering the number of cores used can help when there is not
                    enough RAM per core.])],
-    [GUIX_BUILD_CORES=$withval],
-    [GUIX_BUILD_CORES=0])
+    [GUIX_BUILD_MAX_CORES=$withval],
+    [GUIX_BUILD_MAX_CORES=0])
 
 AC_CHECK_PROG([FOUND_GUIX], [guix], [guix])
 AS_IF([test x"$FOUND_GUIX" = x""],
@@ -45,4 +45,6 @@ AC_OUTPUT
 
 AS_ECHO(["Configuration options:"])
 
-AS_ECHO(["    GUIX_BUILD_CORES: $GUIX_BUILD_CORES"])
+AS_IF([test x"$GUIX_BUILD_MAX_CORES" = x"0"],
+      AS_ECHO(["    GUIX_BUILD_MAX_CORES: not limited."]),
+      AS_ECHO(["    GUIX_BUILD_MAX_CORES: $GUIX_BUILD_MAX_CORES"]))
diff --git a/resources/packages/i945-thinkpads-install-utilities/Makefile.am b/resources/packages/i945-thinkpads-install-utilities/Makefile.am
index 27d5c27..050c907 100644
--- a/resources/packages/i945-thinkpads-install-utilities/Makefile.am
+++ b/resources/packages/i945-thinkpads-install-utilities/Makefile.am
@@ -1,4 +1,4 @@
-# Copyright (C) 2023 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
+# Copyright (C) 2023,2024 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -71,7 +71,7 @@ $(RELEASE_DIR)/packages_src.tar:  Makefile
 		source_guix_profile && \
 		guix time-machine --commit=$(GUIX_REVISION) -- \
 		build \
-		-c $(GUIX_BUILD_CORES) \
+		-c $(GUIX_BUILD_MAX_CORES) \
 		-L $(TOPDIR)/resources/guix/ \
 		-L $(TOPDIR)/resources/guix/gnuboot/patches \
 		--sources=transitive \