diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c
index 0e5766678f6d..c56b99e434b1 100644
--- a/sys/amd64/amd64/trap.c
+++ b/sys/amd64/amd64/trap.c
@@ -313,6 +313,10 @@ trap(struct trapframe *frame)
 			i = SIGBUS;
 			ucode = BUS_OBJERR;
 			break;
+		case T_ALIGNFLT:
+			i = SIGBUS;
+			ucode = BUS_ADRALN;
+			break;
 		case T_DOUBLEFLT:	/* double fault */
 		default:
 			i = SIGBUS;
diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c
index 6e4aba2a2133..5285b1d74583 100644
--- a/sys/i386/i386/trap.c
+++ b/sys/i386/i386/trap.c
@@ -366,6 +366,10 @@ trap(struct trapframe *frame)
 			i = SIGBUS;
 			ucode = BUS_OBJERR;
 			break;
+		case T_ALIGNFLT:
+			i = SIGBUS;
+			ucode = BUS_ADRALN;
+			break;
 		case T_DOUBLEFLT:	/* double fault */
 		default:
 			i = SIGBUS;