diff --git a/tests/lib/icmsg/src/main.c b/tests/lib/icmsg/src/main.c
index 1f1b9628bfc..a6171f1a3fc 100644
--- a/tests/lib/icmsg/src/main.c
+++ b/tests/lib/icmsg/src/main.c
@@ -11,7 +11,7 @@
  * 212 - sizeof(struct icmsg_buf) - 1 = 199.
  * -1 because internal rd/wr_idx is reserved to mean the buffer is empty.
  */
-static uint8_t memory_area[212];
+static uint8_t memory_area[212] __aligned(4);
 
 static void test_icmsg_buf_ut(void)
 {