diff --git a/src/xenia/cpu/ppc/ppc_emit_fpu.cc b/src/xenia/cpu/ppc/ppc_emit_fpu.cc
index 24f2cd732..1aadfa82f 100644
--- a/src/xenia/cpu/ppc/ppc_emit_fpu.cc
+++ b/src/xenia/cpu/ppc/ppc_emit_fpu.cc
@@ -242,10 +242,20 @@ int InstrEmit_fcfidx(PPCHIRBuilder& f, const InstrData& i) {
 
 int InstrEmit_fctidxx_(PPCHIRBuilder& f, const InstrData& i,
                        RoundMode round_mode) {
-  Value* v = f.Convert(f.LoadFPR(i.X.RB), INT64_TYPE, round_mode);
+  auto end = f.NewLabel();
+  auto isnan = f.NewLabel();
+  Value* v;
+  f.BranchTrue(f.IsNan(f.LoadFPR(i.X.RB)), isnan);
+  v = f.Convert(f.LoadFPR(i.X.RB), INT64_TYPE, round_mode);
   v = f.Cast(v, FLOAT64_TYPE);
   f.StoreFPR(i.X.RT, v);
   f.UpdateFPSCR(v, i.X.Rc);
+  f.Branch(end);
+  f.MarkLabel(isnan);
+  v = f.Cast(f.LoadConstantUint64(0x8000000000000000u), FLOAT64_TYPE);
+  f.StoreFPR(i.X.RT, v);
+  f.UpdateFPSCR(v, i.X.Rc);
+  f.MarkLabel(end);
   return 0;
 }
 
@@ -260,10 +270,20 @@ int InstrEmit_fctidzx(PPCHIRBuilder& f, const InstrData& i) {
 
 int InstrEmit_fctiwxx_(PPCHIRBuilder& f, const InstrData& i,
                        RoundMode round_mode) {
-  Value* v = f.Convert(f.LoadFPR(i.X.RB), INT32_TYPE, round_mode);
+  auto end = f.NewLabel();
+  auto isnan = f.NewLabel();
+  Value* v;
+  f.BranchTrue(f.IsNan(f.LoadFPR(i.X.RB)), isnan);
+  v = f.Convert(f.LoadFPR(i.X.RB), INT32_TYPE, round_mode);
   v = f.Cast(f.SignExtend(v, INT64_TYPE), FLOAT64_TYPE);
   f.StoreFPR(i.X.RT, v);
   f.UpdateFPSCR(v, i.X.Rc);
+  f.Branch(end);
+  f.MarkLabel(isnan);
+  v = f.Cast(f.LoadConstantUint32(0x80000000u), FLOAT64_TYPE);
+  f.StoreFPR(i.X.RT, v);
+  f.UpdateFPSCR(v, i.X.Rc);
+  f.MarkLabel(end);
   return 0;
 }