diff --git a/sys/arm/arm/unwind.c b/sys/arm/arm/unwind.c
--- a/sys/arm/arm/unwind.c
+++ b/sys/arm/arm/unwind.c
@@ -398,6 +398,9 @@
 		if (mask == 0)
 			return 1;
 
+		if (!__is_aligned(vsp, sizeof(register_t)))
+			return 1;
+
 		/* Update SP */
 		update_vsp = 1;
 
@@ -430,6 +433,9 @@
 		/* Read how many registers to load */
 		count = insn & INSN_POP_COUNT_MASK;
 
+		if (!__is_aligned(vsp, sizeof(register_t)))
+			return 1;
+
 		/* Update sp */
 		update_vsp = 1;
 
@@ -460,6 +466,9 @@
 		if (mask == 0 || (mask & 0xf0) != 0)
 			return 1;
 
+		if (!__is_aligned(vsp, sizeof(register_t)))
+			return 1;
+
 		/* Update SP */
 		update_vsp = 1;