diff --git a/testing/memtester/Kconfig b/testing/memtester/Kconfig
index 2b093be0e..9a4c17653 100644
--- a/testing/memtester/Kconfig
+++ b/testing/memtester/Kconfig
@@ -32,4 +32,11 @@ config UTILS_MEMTESTER_PRIORITY
 	int "Task PRIORITY"
 	default 100
 
+config UTILS_MEMTESTER_NARROW
+	bool "TEST_NARROW"
+	default n
+	---help---
+		Turn on the "test_8bit_wide_random test_16bit_wide_random" tests, which
+		may result in unaligned access on some platforms.
+
 endif
diff --git a/testing/memtester/Makefile b/testing/memtester/Makefile
index 5f1d5aa60..97cef3bf6 100644
--- a/testing/memtester/Makefile
+++ b/testing/memtester/Makefile
@@ -26,6 +26,10 @@ CSRCS    += memtester/output.c
 
 MAINSRC   = memtester/memtester.c
 
+ifeq ($(CONFIG_UTILS_MEMTESTER_NARROW),y)
+  CFLAGS += -DTEST_NARROW_WRITES
+endif
+
 ifeq ($(wildcard memtester/.git),)
 VERSION ?= master
 memtester.zip: