diff --git a/sys/boot/powerpc/ps3/ps3mmu.c b/sys/boot/powerpc/ps3/ps3mmu.c
index a7005fb9e55..08dcf75d283 100644
--- a/sys/boot/powerpc/ps3/ps3mmu.c
+++ b/sys/boot/powerpc/ps3/ps3mmu.c
@@ -113,7 +113,7 @@ ps3mmu_init(int maxmem)
 	    "r"(1 << SLBV_VSID_SHIFT),
 	    "r"((1 << SLBE_ESID_SHIFT) | SLBE_VALID | 1));
 
-	mtmsr(mfmsr() | PSL_IR | PSL_DR | PSL_RI | PSL_ME);
+	mtmsr(PSL_IR | PSL_DR | PSL_RI | PSL_ME);
 
 	return (0);
 }