diff --git a/src/xenia/cpu/ppc/ppc_emit_altivec.cc b/src/xenia/cpu/ppc/ppc_emit_altivec.cc
index b8257c1bc..437b3f09b 100644
--- a/src/xenia/cpu/ppc/ppc_emit_altivec.cc
+++ b/src/xenia/cpu/ppc/ppc_emit_altivec.cc
@@ -1662,7 +1662,11 @@ int InstrEmit_vsrw128(PPCHIRBuilder& f, const InstrData& i) {
 }
 
 int InstrEmit_vsubcuw(PPCHIRBuilder& f, const InstrData& i) {
-  XEINSTRNOTIMPLEMENTED();
+  Value* underflow =
+      f.VectorCompareUGE(f.LoadVR(i.VX.VA), f.LoadVR(i.VX.VB), INT32_TYPE);
+  Value* borrow =
+      f.VectorShr(underflow, f.LoadConstantVec128(vec128i(31)), INT32_TYPE);
+  f.StoreVR(i.VX.VD, borrow);
   return 1;
 }