diff --git a/sys/arm/arm/machdep.c b/sys/arm/arm/machdep.c
--- a/sys/arm/arm/machdep.c
+++ b/sys/arm/arm/machdep.c
@@ -120,8 +120,6 @@
 /* The address at which the kernel was loaded.  Set early in initarm(). */
 vm_paddr_t arm_physmem_kernaddr;
 
-extern int *end;
-
 #ifdef FDT
 vm_paddr_t pmap_pa;
 vm_offset_t systempage;
diff --git a/sys/arm/arm/machdep_boot.c b/sys/arm/arm/machdep_boot.c
--- a/sys/arm/arm/machdep_boot.c
+++ b/sys/arm/arm/machdep_boot.c
@@ -69,7 +69,7 @@
 static char static_kenv[4096];
 #endif
 
-extern int *end;
+extern char end[];
 
 static uint32_t board_revision;
 /* hex representation of uint64_t */
diff --git a/sys/arm64/arm64/machdep_boot.c b/sys/arm64/arm64/machdep_boot.c
--- a/sys/arm64/arm64/machdep_boot.c
+++ b/sys/arm64/arm64/machdep_boot.c
@@ -53,7 +53,7 @@
 #include <ddb/ddb.h>
 #endif
 
-extern int *end;
+extern char end[];
 static char *loader_envp;
 
 #ifdef FDT
diff --git a/sys/riscv/riscv/machdep.c b/sys/riscv/riscv/machdep.c
--- a/sys/riscv/riscv/machdep.c
+++ b/sys/riscv/riscv/machdep.c
@@ -118,7 +118,7 @@
 
 cpuset_t all_harts;
 
-extern int *end;
+extern char end[];
 
 static char static_kenv[PAGE_SIZE];