diff --git a/samples/drivers/crypto/src/main.c b/samples/drivers/crypto/src/main.c
index ef0d248c365..ac031e88672 100644
--- a/samples/drivers/crypto/src/main.c
+++ b/samples/drivers/crypto/src/main.c
@@ -37,7 +37,7 @@ LOG_MODULE_REGISTER(main);
 #error "You need to enable one crypto device"
 #endif
 
-const static uint8_t key[16] __aligned(32) = {
+const static uint8_t key[16] __aligned(4) = {
 	0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88,
 	0x09, 0xcf, 0x4f, 0x3c
 };