diff --git a/rpcs3/Emu/RSX/D3D12/VertexProgramDecompiler.cpp b/rpcs3/Emu/RSX/D3D12/VertexProgramDecompiler.cpp
index 10facd5b5c..9fc6af2b09 100644
--- a/rpcs3/Emu/RSX/D3D12/VertexProgramDecompiler.cpp
+++ b/rpcs3/Emu/RSX/D3D12/VertexProgramDecompiler.cpp
@@ -542,7 +542,7 @@ void VertexDecompiler::insertMainStart(std::stringstream & OS)
 	for (const ParamType PT : m_parr.params[PF_PARAM_NONE])
 	{
 		for (const ParamItem &PI : PT.items)
-			OS << "	" << PT.type << " " << PI.name << " = float4(0., 0., 0., 0.);" << std::endl;
+			OS << "	" << PT.type << " " << PI.name << " = float4(0., 0., 0., 1.);" << std::endl;
 	}
 
 	for (const ParamType PT : m_parr.params[PF_PARAM_IN])