diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 2560b70c5f..66e13075c3 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -327,6 +327,7 @@ typedef enum {
 #define MSR_S    22 /* Secure state                                          */
 #define MSR_KEY  19 /* key bit on 603e                                       */
 #define MSR_POW  18 /* Power management                                      */
+#define MSR_WE   18 /* Wait State Enable on 405                              */
 #define MSR_TGPR 17 /* TGPR usage on 602/603                        x        */
 #define MSR_CE   17 /* Critical interrupt enable on embedded PowerPC x       */
 #define MSR_ILE  16 /* Interrupt little-endian mode                          */
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index e30e86fe9d..e63705b1c6 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -2535,7 +2535,7 @@ POWERPC_FAMILY(405)(ObjectClass *oc, void *data)
                        PPC_MEM_SYNC | PPC_MEM_EIEIO |
                        PPC_40x_TLB | PPC_MEM_TLBIA | PPC_MEM_TLBSYNC |
                        PPC_4xx_COMMON | PPC_405_MAC | PPC_40x_EXCP;
-    pcc->msr_mask = (1ull << MSR_POW) |
+    pcc->msr_mask = (1ull << MSR_WE) |
                     (1ull << MSR_CE) |
                     (1ull << MSR_EE) |
                     (1ull << MSR_PR) |