diff --git a/Sources/CodeGen/LLVM/ConcreteTypeLayout.swift b/Sources/CodeGen/LLVM/ConcreteTypeLayout.swift
index ea21b848f..3be0fa122 100644
--- a/Sources/CodeGen/LLVM/ConcreteTypeLayout.swift
+++ b/Sources/CodeGen/LLVM/ConcreteTypeLayout.swift
@@ -71,8 +71,6 @@ struct ConcreteTypeLayout {
       self.init(size: 8, alignment: 8)
     case .float128:
       self.init(size: 16, alignment: 8)
-    case .void:
-      notLLVMRepresentable(^t) // Cannot be used in a type layout.
     case .module:
       notLLVMRepresentable(^t)
     }
diff --git a/Sources/CodeGen/LLVM/TypeLowering.swift b/Sources/CodeGen/LLVM/TypeLowering.swift
index 797ebb529..2af3bacf4 100644
--- a/Sources/CodeGen/LLVM/TypeLowering.swift
+++ b/Sources/CodeGen/LLVM/TypeLowering.swift
@@ -74,8 +74,6 @@ extension IR.Program {
       return SwiftyLLVM.FloatingPointType.fp128(in: &module)
     case .ptr:
       return module.ptr
-    case .void:
-      return SwiftyLLVM.VoidType(in: &module)
     case .module:
       notLLVMRepresentable(t)
     }
diff --git a/Sources/FrontEnd/Types/BuiltinType.swift b/Sources/FrontEnd/Types/BuiltinType.swift
index e5ae0dc16..95581f214 100644
--- a/Sources/FrontEnd/Types/BuiltinType.swift
+++ b/Sources/FrontEnd/Types/BuiltinType.swift
@@ -25,9 +25,6 @@ public enum BuiltinType: TypeProtocol {
   /// A built-in opaque pointer.
   case ptr
 
-  /// A built-in void type.
-  case void
-
   /// The type of the built-in module.
   case module
 
@@ -66,8 +63,6 @@ extension BuiltinType: CustomStringConvertible {
       return "float128"
     case .ptr:
       return "ptr"
-    case .void:
-      return "void"
     case .module:
       return "Builtin"
     }
@@ -91,8 +86,6 @@ extension BuiltinType: LosslessStringConvertible {
       self = .float128
     case "ptr":
       self = .ptr
-    case "void":
-      self = .void
     case "Builtin":
       self = .module
 
diff --git a/Sources/IR/Mangling/Demangler.swift b/Sources/IR/Mangling/Demangler.swift
index c32a6be69..47a4a44c8 100644
--- a/Sources/IR/Mangling/Demangler.swift
+++ b/Sources/IR/Mangling/Demangler.swift
@@ -42,8 +42,6 @@ struct Demangler {
         demangled = takeBuiltinFloatType(from: &stream)
       case .builtinPointerType:
         demangled = .type(.builtin(.ptr))
-      case .builtinVoidType:
-        demangled = .type(.builtin(.void))
       case .builtinModuleType:
         demangled = .type(.builtin(.module))
       case .builtinWordType:
diff --git a/Sources/IR/Mangling/Mangler.swift b/Sources/IR/Mangling/Mangler.swift
index 9609fcdb7..8715d5a6d 100644
--- a/Sources/IR/Mangling/Mangler.swift
+++ b/Sources/IR/Mangling/Mangler.swift
@@ -560,8 +560,6 @@ struct Mangler {
       append(integer: 128, to: &output)
     case .ptr:
       append(operator: .builtinPointerType, to: &output)
-    case .void:
-      append(operator: .builtinVoidType, to: &output)
     case .module:
       append(operator: .builtinModuleType, to: &output)
     }
diff --git a/Sources/IR/Mangling/ManglingOperator.swift b/Sources/IR/Mangling/ManglingOperator.swift
index 127324a44..337ba7417 100644
--- a/Sources/IR/Mangling/ManglingOperator.swift
+++ b/Sources/IR/Mangling/ManglingOperator.swift
@@ -72,8 +72,6 @@ public enum ManglingOperator: String {
 
   case builtinPointerType = "bpT"
 
-  case builtinVoidType = "bvT"
-
   case builtinModuleType = "bmT"
 
   case builtinWordType = "bwT"