diff --git a/sys/powerpc/powerpc/exec_machdep.c b/sys/powerpc/powerpc/exec_machdep.c
--- a/sys/powerpc/powerpc/exec_machdep.c
+++ b/sys/powerpc/powerpc/exec_machdep.c
@@ -528,8 +528,8 @@
 	 * Additionally, ensure VSX is disabled as well, as it is illegal
 	 * to leave it turned on when FP or VEC are off.
 	 */
-	tf->srr1 &= ~(PSL_FP | PSL_VSX);
-	pcb->pcb_flags &= ~(PCB_FPU | PCB_VSX);
+	tf->srr1 &= ~(PSL_FP | PSL_VSX | PSL_VEC);
+	pcb->pcb_flags &= ~(PCB_FPU | PCB_VSX | PCB_VEC);
 
 	if (mcp->mc_flags & _MC_FP_VALID) {
 		/* enable_fpu() will happen lazily on a fault */
@@ -550,9 +550,6 @@
 		pcb->pcb_vec.vscr = mcp->mc_vscr;
 		pcb->pcb_vec.vrsave = mcp->mc_vrsave;
 		memcpy(pcb->pcb_vec.vr, mcp->mc_avec, sizeof(mcp->mc_avec));
-	} else {
-		tf->srr1 &= ~PSL_VEC;
-		pcb->pcb_flags &= ~PCB_VEC;
 	}
 
 	return (0);