diff --git a/src/ipc/ipc4/helper.c b/src/ipc/ipc4/helper.c
index f727d212f179..1bbe23acabb7 100644
--- a/src/ipc/ipc4/helper.c
+++ b/src/ipc/ipc4/helper.c
@@ -942,7 +942,7 @@ int ipc4_process_on_core(uint32_t core, bool blocking)
 
 __cold static const struct comp_driver *ipc4_get_drv(const void *uuid)
 {
-	const struct sof_uuid *const sof_uuid = (const struct sof_uuid *)uuid;
+	const struct sof_uuid *const sof_uuid __maybe_unused = (const struct sof_uuid *)uuid;
 	struct comp_driver_list *drivers = comp_drivers_get();
 	struct list_item *clist;
 	const struct comp_driver *drv = NULL;
diff --git a/src/platform/posix/ipc.c b/src/platform/posix/ipc.c
index b8c54b9a38d9..f9fc0213987f 100644
--- a/src/platform/posix/ipc.c
+++ b/src/platform/posix/ipc.c
@@ -45,8 +45,6 @@ static size_t fuzz_in_sz;
 static void fuzz_isr(const void *arg)
 {
 	size_t rem, i, n = MIN(posix_fuzz_sz, sizeof(fuzz_in) - fuzz_in_sz);
-	bool comp_new = false;
-	int comp_idx = 0;
 
 	for (i = 0; i < n; i++)
 		fuzz_in[fuzz_in_sz++] = posix_fuzz_buf[i];
@@ -68,6 +66,9 @@ static void fuzz_isr(const void *arg)
 	fuzz_in_sz = rem;
 
 #ifdef CONFIG_IPC_MAJOR_3
+	bool comp_new = false;
+	int comp_idx = 0;
+
 	// One special case: a first byte of 0xff (which is in the
 	// otherwise-ignored size value at the front of the command --
 	// we rewrite those) is interpreted as a "component new"