diff --git a/src/lib/alloc.c b/src/lib/alloc.c
index e7a1c5e7c..0d74f5c4f 100644
--- a/src/lib/alloc.c
+++ b/src/lib/alloc.c
@@ -841,4 +841,6 @@ void init_heap(struct sof *sof)
 	write_pattern((struct mm_heap *)&memmap.runtime, PLATFORM_HEAP_RUNTIME,
 				  DEBUG_BLOCK_FREE_VALUE);
 #endif
+
+	dcache_writeback_invalidate_region(&memmap, sizeof(memmap));
 }