diff --git a/Kconfig b/Kconfig
index 0f3a644d06..4667f25481 100644
--- a/Kconfig
+++ b/Kconfig
@@ -6,6 +6,9 @@
 #
 mainmenu "RIOT Configuration"
 
+# Load macro definitions
+rsource "kconfig/Kconfig.consts"
+
 # For now, get used modules as macros from this file (see kconfig.mk)
 osource "$(KCONFIG_GENERATED_DEPENDENCIES)"
 
diff --git a/kconfig/Kconfig.consts b/kconfig/Kconfig.consts
new file mode 100644
index 0000000000..517ef86f1f
--- /dev/null
+++ b/kconfig/Kconfig.consts
@@ -0,0 +1,7 @@
+# Copyright (c) 2020 Freie Universitaet Berlin
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+UINT32_MAX:=4294967295