diff --git a/src/writer/spirv/builder.cc b/src/writer/spirv/builder.cc
index 382681b..cf3ee87 100644
--- a/src/writer/spirv/builder.cc
+++ b/src/writer/spirv/builder.cc
@@ -138,11 +138,10 @@
 Builder::~Builder() = default;
 
 bool Builder::Build() {
-  push_capability(spv::Op::OpCapability, {Operand::Int(SpvCapabilityShader)});
+  push_capability(SpvCapabilityShader);
 
   // TODO(dneto): Stop using the Vulkan memory model. crbug.com/tint/63
-  push_capability(spv::Op::OpCapability,
-                  {Operand::Int(SpvCapabilityVulkanMemoryModel)});
+  push_capability(SpvCapabilityVulkanMemoryModel);
   push_preamble(spv::Op::OpExtension,
                 {Operand::String("SPV_KHR_vulkan_memory_model")});
 
@@ -221,6 +220,11 @@
   }
 }
 
+void Builder::push_capability(uint32_t cap) {
+  capabilities_.push_back(
+      Instruction{spv::Op::OpCapability, {Operand::Int(cap)}});
+}
+
 uint32_t Builder::GenerateU32Literal(uint32_t val) {
   ast::type::U32Type u32;
   ast::SintLiteral lit(&u32, val);
@@ -1251,8 +1255,7 @@
 
   if (ast::intrinsic::IsFineDerivative(name) ||
       ast::intrinsic::IsCoarseDerivative(name)) {
-    push_capability(spv::Op::OpCapability,
-                    {Operand::Int(SpvCapabilityDerivativeControl)});
+    push_capability(SpvCapabilityDerivativeControl);
   }
 
   spv::Op op = spv::Op::OpNop;
diff --git a/src/writer/spirv/builder.h b/src/writer/spirv/builder.h
index b8ac524..61a2e36 100644
--- a/src/writer/spirv/builder.h
+++ b/src/writer/spirv/builder.h
@@ -120,11 +120,8 @@
   void iterate(std::function<void(const Instruction&)> cb) const;
 
   /// Adds an instruction to the list of capabilities
-  /// @param op the op to set
-  /// @param operands the operands for the instruction
-  void push_capability(spv::Op op, const std::vector<Operand>& operands) {
-    capabilities_.push_back(Instruction{op, operands});
-  }
+  /// @param cap the capability to set
+  void push_capability(uint32_t cap);
   /// @returns the capabilities
   const std::vector<Instruction>& capabilities() const { return capabilities_; }
   /// Adds an instruction to the preamble