diff --git a/sys/powerpc/aim/aim_machdep.c b/sys/powerpc/aim/aim_machdep.c
index e6bf48ae41c0..3f9bbe988a56 100644
--- a/sys/powerpc/aim/aim_machdep.c
+++ b/sys/powerpc/aim/aim_machdep.c
@@ -629,7 +629,8 @@ flush_disable_caches(void)
 	mtspr(SPR_MSSCR0, msscr0);
 	powerpc_sync();
 	isync();
-	__asm__ __volatile__("dssall; sync");
+	/* 7e00066c: dssall */
+	__asm__ __volatile__(".long 0x7e00066c; sync");
 	powerpc_sync();
 	isync();
 	__asm__ __volatile__("dcbf 0,%0" :: "r"(0));
diff --git a/sys/powerpc/powerpc/cpu.c b/sys/powerpc/powerpc/cpu.c
index 8967bcd9804f..ad30d2853d0f 100644
--- a/sys/powerpc/powerpc/cpu.c
+++ b/sys/powerpc/powerpc/cpu.c
@@ -753,8 +753,9 @@ cpu_idle_60x(sbintime_t sbt)
 	case MPC7450:
 	case MPC7455:
 	case MPC7457:
+		/* 0x7e00066c: dssall */
 		__asm __volatile("\
-			    dssall; sync; mtmsr %0; isync"
+			    .long 0x7e00066c; sync; mtmsr %0; isync"
 			    :: "r"(msr | PSL_POW));
 		break;
 	default: