diff --git a/target/ppc/cpu.c b/target/ppc/cpu.c
index f933d9f2bd84..d7b42bae52d6 100644
--- a/target/ppc/cpu.c
+++ b/target/ppc/cpu.c
@@ -112,7 +112,7 @@ static inline void fpscr_set_rounding_mode(CPUPPCState *env)
 
 void ppc_store_fpscr(CPUPPCState *env, target_ulong val)
 {
-    val &= ~(FP_VX | FP_FEX);
+    val &= FPSCR_MTFS_MASK;
     if (val & FPSCR_IX) {
         val |= FP_VX;
     }
diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index e946da5f3a8c..441d3dce194c 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -759,6 +759,10 @@ enum {
                           FP_VXZDZ  | FP_VXIMZ  | FP_VXVC   | FP_VXSOFT | \
                           FP_VXSQRT | FP_VXCVI)
 
+/* FPSCR bits that can be set by mtfsf, mtfsfi and mtfsb1 */
+#define FPSCR_MTFS_MASK (~(MAKE_64BIT_MASK(36, 28) | PPC_BIT(28) |        \
+                           FP_FEX | FP_VX | PPC_BIT(52)))
+
 /*****************************************************************************/
 /* Vector status and control register */
 #define VSCR_NJ         16 /* Vector non-java */