diff --git a/src/backend_x64/emit_x64_vector.cpp b/src/backend_x64/emit_x64_vector.cpp
index 6f5dd977..e47eeb6e 100644
--- a/src/backend_x64/emit_x64_vector.cpp
+++ b/src/backend_x64/emit_x64_vector.cpp
@@ -2231,7 +2231,7 @@ static void EmitVectorSignedSaturatedNarrowToSigned(size_t original_esize, Block
     } else {
         code.pcmpeqd(reconstructed, src);
         code.movmskps(bit, reconstructed);
-        code.cmp(bit, 0);
+        code.cmp(bit, 0xF);
     }
 
     code.setnz(bit.cvt8());
@@ -2294,7 +2294,7 @@ static void EmitVectorSignedSaturatedNarrowToUnsigned(size_t original_esize, Blo
     } else {
         code.pcmpeqd(reconstructed, src);
         code.movmskps(bit, reconstructed);
-        code.cmp(bit, 0);
+        code.cmp(bit, 0xF);
     }
 
     code.setnz(bit.cvt8());