diff --git a/cpp/ql/src/semmle/code/cpp/commons/CommonType.qll b/cpp/ql/src/semmle/code/cpp/commons/CommonType.qll
index c04d2cba45e..c4eb0ff1c2a 100644
--- a/cpp/ql/src/semmle/code/cpp/commons/CommonType.qll
+++ b/cpp/ql/src/semmle/code/cpp/commons/CommonType.qll
@@ -166,3 +166,17 @@ class MicrosoftInt64Type extends IntegralType {
     not isExplicitlySigned()
   }
 }
+
+/**
+ * The `__builtin_va_list` type, used to provide variadic functionality.
+ *
+ * This is a complement to the `__builtin_va_start`, `__builtin_va_end`,
+ * `__builtin_va_copy` and `__builtin_va_arg` expressions.
+ */
+class BuiltInVarArgsList extends Type {
+  BuiltInVarArgsList() {
+    this.hasName("__builtin_va_list")
+  }
+
+  override string getCanonicalQLClass() { result = "BuiltInVarArgsList" }
+}