diff --git a/sys/arm/arm/machdep.c b/sys/arm/arm/machdep.c
index e6e0e7ff064c..e2310f1cd353 100644
--- a/sys/arm/arm/machdep.c
+++ b/sys/arm/arm/machdep.c
@@ -1443,7 +1443,7 @@ initarm(struct arm_boot_params *abp)
 	struct pv_addr kernel_l1pt;
 	struct pv_addr dpcpu;
 	vm_offset_t dtbp, freemempos, l2_start, lastaddr;
-	u_long memsize;
+	uint64_t memsize;
 	uint32_t l2size;
 	char *env;
 	void *kmdp;
diff --git a/sys/dev/fdt/fdt_common.c b/sys/dev/fdt/fdt_common.c
index b435551d89c8..6211aca7a01a 100644
--- a/sys/dev/fdt/fdt_common.c
+++ b/sys/dev/fdt/fdt_common.c
@@ -647,12 +647,12 @@ fdt_get_reserved_regions(struct mem_region *mr, int *mrcnt)
 }
 
 int
-fdt_get_mem_regions(struct mem_region *mr, int *mrcnt, u_long *memsize)
+fdt_get_mem_regions(struct mem_region *mr, int *mrcnt, uint64_t *memsize)
 {
 	pcell_t reg[FDT_REG_CELLS * FDT_MEM_REGIONS];
 	pcell_t *regp;
 	phandle_t memory;
-	u_long memory_size;
+	uint64_t memory_size;
 	int addr_cells, size_cells;
 	int i, max_size, reg_len, rv, tuple_size, tuples;
 
diff --git a/sys/dev/fdt/fdt_common.h b/sys/dev/fdt/fdt_common.h
index 278244e189e2..db27b437fdc9 100644
--- a/sys/dev/fdt/fdt_common.h
+++ b/sys/dev/fdt/fdt_common.h
@@ -85,7 +85,7 @@ u_long fdt_data_get(void *, int);
 int fdt_data_to_res(pcell_t *, int, int, u_long *, u_long *);
 phandle_t fdt_find_compatible(phandle_t, const char *, int);
 phandle_t fdt_depth_search_compatible(phandle_t, const char *, int);
-int fdt_get_mem_regions(struct mem_region *, int *, u_long *);
+int fdt_get_mem_regions(struct mem_region *, int *, uint64_t *);
 int fdt_get_reserved_regions(struct mem_region *, int *);
 int fdt_get_phyaddr(phandle_t, device_t, int *, void **);
 int fdt_get_range(phandle_t, int, u_long *, u_long *);
diff --git a/sys/mips/beri/beri_machdep.c b/sys/mips/beri/beri_machdep.c
index 50d8b716787f..2c153e47c798 100644
--- a/sys/mips/beri/beri_machdep.c
+++ b/sys/mips/beri/beri_machdep.c
@@ -90,8 +90,8 @@ mips_init(void)
 	int i;
 #ifdef FDT
 	struct mem_region mr[FDT_MEM_REGIONS];
+	uint64_t val;
 	int mr_cnt;
-	u_long val;
 	int j;
 #endif