diff --git a/subsys/ipc/ipc_service/backends/ipc_icbmsg.c b/subsys/ipc/ipc_service/backends/ipc_icbmsg.c
index 927950dd50aa1..29b9ba2d9d4cb 100644
--- a/subsys/ipc/ipc_service/backends/ipc_icbmsg.c
+++ b/subsys/ipc/ipc_service/backends/ipc_icbmsg.c
@@ -1295,6 +1295,11 @@ const static struct ipc_service_backend backend_ops = {
 	.release_rx_buffer = release_rx_buffer,
 };
 
+/**
+ * Required block alignment.
+ */
+#define BLOCK_ALIGNMENT sizeof(uint32_t)
+
 /**
  * Number of bytes per each ICMsg message. It is used to calculate size of ICMsg area.
  */
@@ -1308,10 +1313,10 @@ const static struct ipc_service_backend backend_ops = {
 	(PBUF_HEADER_OVERHEAD(GET_CACHE_ALIGNMENT(i)) + 2 * BYTES_PER_ICMSG_MESSAGE)
 
 /**
- * Returns required block alignment for instance "i".
+ * Returns required data cache alignment for instance "i".
  */
 #define GET_CACHE_ALIGNMENT(i) \
-	MAX(sizeof(uint32_t), DT_INST_PROP_OR(i, dcache_alignment, 0))
+	MAX(BLOCK_ALIGNMENT, DT_INST_PROP_OR(i, dcache_alignment, 0))
 
 /**
  * Calculates minimum size required for ICMsg region for specific number of local
@@ -1319,9 +1324,9 @@ const static struct ipc_service_backend backend_ops = {
  * because it can hold data message for each local block and release message
  * for each remote block.
  */
-#define GET_ICMSG_MIN_SIZE(i, local_blocks, remote_blocks)				\
+#define GET_ICMSG_MIN_SIZE(i, local_blocks, remote_blocks) ROUND_UP(			\
 	(ICMSG_BUFFER_OVERHEAD(i) + BYTES_PER_ICMSG_MESSAGE *				\
-	 (local_blocks + remote_blocks))
+	 (local_blocks + remote_blocks)), GET_CACHE_ALIGNMENT(i))
 
 /**
  * Calculate aligned block size by evenly dividing remaining space after removing
@@ -1329,7 +1334,7 @@ const static struct ipc_service_backend backend_ops = {
  */
 #define GET_BLOCK_SIZE(i, total_size, local_blocks, remote_blocks) ROUND_DOWN(		\
 	((total_size) - GET_ICMSG_MIN_SIZE(i, (local_blocks), (remote_blocks))) /	\
-	(local_blocks), GET_CACHE_ALIGNMENT(i))
+	(local_blocks), BLOCK_ALIGNMENT)
 
 /**
  * Calculate offset where area for blocks starts which is just after the ICMsg.
@@ -1434,11 +1439,11 @@ const static struct ipc_service_backend backend_ops = {
 	};										\
 	BUILD_ASSERT(IS_POWER_OF_TWO(GET_CACHE_ALIGNMENT(i)),				\
 		     "This module supports only power of two cache alignment");		\
-	BUILD_ASSERT((GET_BLOCK_SIZE_INST(i, tx, rx) >= GET_CACHE_ALIGNMENT(i)) &&	\
+	BUILD_ASSERT((GET_BLOCK_SIZE_INST(i, tx, rx) >= BLOCK_ALIGNMENT) &&		\
 		     (GET_BLOCK_SIZE_INST(i, tx, rx) <					\
 		      GET_MEM_SIZE_INST(i, tx)),					\
 		     "TX region is too small for provided number of blocks");		\
-	BUILD_ASSERT((GET_BLOCK_SIZE_INST(i, rx, tx) >= GET_CACHE_ALIGNMENT(i)) &&	\
+	BUILD_ASSERT((GET_BLOCK_SIZE_INST(i, rx, tx) >= BLOCK_ALIGNMENT) &&		\
 		     (GET_BLOCK_SIZE_INST(i, rx, tx) <					\
 		      GET_MEM_SIZE_INST(i, rx)),					\
 		     "RX region is too small for provided number of blocks");		\