diff --git a/sys/amd64/amd64/db_trace.c b/sys/amd64/amd64/db_trace.c
--- a/sys/amd64/amd64/db_trace.c
+++ b/sys/amd64/amd64/db_trace.c
@@ -205,7 +205,8 @@
 	 */
 	tf_addr = *fp + 16;
 
-	if (!__is_aligned(tf_addr, _Alignof(*tf)) || !INKERNEL(tf_addr)) {
+	if (!__is_aligned(tf_addr, _Alignof(struct trapframe)) ||
+	    !INKERNEL(tf_addr)) {
 		db_printf("--- invalid trapframe %p\n", (void *)tf_addr);
 		*ip = 0;
 		*fp = 0;
diff --git a/sys/arm64/arm64/db_trace.c b/sys/arm64/arm64/db_trace.c
--- a/sys/arm64/arm64/db_trace.c
+++ b/sys/arm64/arm64/db_trace.c
@@ -92,7 +92,7 @@
 			struct trapframe *tf;
 
 			tf = (struct trapframe *)(uintptr_t)frame->fp - 1;
-			if (!__is_aligned(tf, _Alignof(*tf)) ||
+			if (!__is_aligned(tf, _Alignof(struct trapframe)) ||
 			    !kstack_contains(td, (vm_offset_t)tf,
 			    sizeof(*tf))) {
 				db_printf("--- invalid trapframe %p\n", tf);
diff --git a/sys/riscv/riscv/db_trace.c b/sys/riscv/riscv/db_trace.c
--- a/sys/riscv/riscv/db_trace.c
+++ b/sys/riscv/riscv/db_trace.c
@@ -83,7 +83,7 @@
 			struct trapframe *tf;
 
 			tf = (struct trapframe *)(uintptr_t)frame->sp;
-			if (!__is_aligned(tf, _Alignof(*tf)) ||
+			if (!__is_aligned(tf, _Alignof(struct trapframe)) ||
 			    !kstack_contains(td, (vm_offset_t)tf,
 			    sizeof(*tf))) {
 				db_printf("--- invalid trapframe %p\n", tf);