diff --git a/src/graphics/shader/recompiler/backend/spirv/SpirvBuilder.cpp b/src/graphics/shader/recompiler/backend/spirv/SpirvBuilder.cpp
index 10efe2ca..33051f9a 100644
--- a/src/graphics/shader/recompiler/backend/spirv/SpirvBuilder.cpp
+++ b/src/graphics/shader/recompiler/backend/spirv/SpirvBuilder.cpp
@@ -171,10 +171,12 @@ void Builder::AddFunction(std::span<const uint32_t> words) {
 }
 
 DeferredPhi Builder::AddDeferredPhi(uint32_t type, uint32_t result, size_t incoming_count) {
-	std::vector<uint32_t> words {spv::OpPhi, type, result};
-	words.resize(words.size() + incoming_count * 2u);
 	const DeferredPhi phi {m_functions.size()};
-	AddFunction(words);
+	const auto word_count = static_cast<uint32_t>(3u + incoming_count * 2u);
+	m_functions.push_back((word_count << spv::WordCountShift) | spv::OpPhi);
+	m_functions.push_back(type);
+	m_functions.push_back(result);
+	m_functions.resize(m_functions.size() + incoming_count * 2u);
 	m_unpatched_phi_incomings += incoming_count;
 	return phi;
 }