diff --git a/samples/modules/nanopb/Kconfig b/samples/modules/nanopb/Kconfig
new file mode 100644
index 00000000000..8e91baf5174
--- /dev/null
+++ b/samples/modules/nanopb/Kconfig
@@ -0,0 +1,14 @@
+# Private config options for nanopb app
+
+# Copyright (c) 2024 Basalte bv
+# SPDX-License-Identifier: Apache-2.0
+
+mainmenu "Nanopb protobuf sample application"
+
+config SAMPLE_BUFFER_SIZE
+	int "Simple message buffer size"
+	default 8
+	help
+	  Configure the simple message buffer field's size.
+
+source "Kconfig.zephyr"
diff --git a/samples/modules/nanopb/src/simple.options b/samples/modules/nanopb/src/simple.options
deleted file mode 100644
index 47c1f05de08..00000000000
--- a/samples/modules/nanopb/src/simple.options
+++ /dev/null
@@ -1 +0,0 @@
-SimpleMessage.buffer max_size:8 fixed_length:true
diff --git a/samples/modules/nanopb/src/simple.options.in b/samples/modules/nanopb/src/simple.options.in
new file mode 100644
index 00000000000..7089a0a08c0
--- /dev/null
+++ b/samples/modules/nanopb/src/simple.options.in
@@ -0,0 +1 @@
+SimpleMessage.buffer max_size:@CONFIG_SAMPLE_BUFFER_SIZE@ fixed_length:true