diff --git a/src/include/memlayout.h b/src/include/memlayout.h
index 43a1cac..a68b21f 100644
--- a/src/include/memlayout.h
+++ b/src/include/memlayout.h
@@ -75,7 +75,8 @@
 #define DRAM_START(addr) SYMBOL(dram, addr)
 
 #define TIMESTAMP(addr, size) \
-	REGION(timestamp, addr, size, 8)
+	REGION(timestamp, addr, size, 8) \
+	_ = ASSERT(size >= 212, "Timestamp region must fit timestamp_cache!");
 
 #define PRERAM_CBMEM_CONSOLE(addr, size) \
 	REGION(preram_cbmem_console, addr, size, 4)
diff --git a/src/lib/timestamp.c b/src/lib/timestamp.c
index d8b93f9..2f2a5d8 100644
--- a/src/lib/timestamp.c
+++ b/src/lib/timestamp.c
@@ -27,6 +27,7 @@
 
 #define MAX_TIMESTAMPS 84
 
+/* When changing this number, adjust TIMESTAMP() size ASSERT() in memlayout.h */
 #define MAX_BSS_TIMESTAMP_CACHE 16
 
 struct __attribute__((__packed__)) timestamp_cache {