diff --git a/Targets/Bonito3a780e/Bonito/tgt_machdep.c b/Targets/Bonito3a780e/Bonito/tgt_machdep.c
index 7eef41cd..d5278958 100644
--- a/Targets/Bonito3a780e/Bonito/tgt_machdep.c
+++ b/Targets/Bonito3a780e/Bonito/tgt_machdep.c
@@ -3074,7 +3074,7 @@ struct efi_memory_map_loongson * init_memory_map()
 {
 	struct efi_memory_map_loongson *emap = &g_map;
 	int i = 0;
-	unsigned long size = memorysize_high;
+	unsigned long long size = memorysize_high;
 
 #define EMAP_ENTRY(entry, node, type, start, size) \
 	emap->map[(entry)].node_id = (node), \
diff --git a/Targets/Bonito3aserver/Bonito/tgt_machdep.c b/Targets/Bonito3aserver/Bonito/tgt_machdep.c
index c28ff874..546e99a2 100644
--- a/Targets/Bonito3aserver/Bonito/tgt_machdep.c
+++ b/Targets/Bonito3aserver/Bonito/tgt_machdep.c
@@ -3079,7 +3079,7 @@ struct efi_memory_map_loongson * init_memory_map()
 {
 	struct efi_memory_map_loongson *emap = &g_map;
 	int i = 0;
-	unsigned long size = memorysize_high;
+	unsigned long long size = memorysize_high;
 
 #define EMAP_ENTRY(entry, node, type, start, size) \
 	emap->map[(entry)].node_id = (node), \
diff --git a/Targets/Bonito3c780e/Bonito/tgt_machdep.c b/Targets/Bonito3c780e/Bonito/tgt_machdep.c
index e64e6732..c7f4eb55 100644
--- a/Targets/Bonito3c780e/Bonito/tgt_machdep.c
+++ b/Targets/Bonito3c780e/Bonito/tgt_machdep.c
@@ -3173,7 +3173,7 @@ struct efi_memory_map_loongson * init_memory_map()
 {
 	struct efi_memory_map_loongson *emap = &g_map;
 	int i = 0;
-	unsigned long size = memorysize_high;
+	unsigned long long size = memorysize_high;
 
 #define EMAP_ENTRY(entry, node, type, start, size) \
 	emap->map[(entry)].node_id = (node), \