diff --git a/CodeGen/src/AssemblyBuilderX64.cpp b/CodeGen/src/AssemblyBuilderX64.cpp
index bed7e0e3..f999d753 100644
--- a/CodeGen/src/AssemblyBuilderX64.cpp
+++ b/CodeGen/src/AssemblyBuilderX64.cpp
@@ -826,7 +826,7 @@ void AssemblyBuilderX64::vcvtss2sd(OperandX64 dst, OperandX64 src1, OperandX64 s
     else
         CODEGEN_ASSERT(src2.memSize == SizeX64::dword);
 
-    placeAvx("vcvtsd2ss", dst, src1, src2, 0x5a, false, AVX_0F, AVX_F3);
+    placeAvx("vcvtss2sd", dst, src1, src2, 0x5a, false, AVX_0F, AVX_F3);
 }
 
 void AssemblyBuilderX64::vroundsd(OperandX64 dst, OperandX64 src1, OperandX64 src2, RoundingModeX64 roundingMode)