diff --git a/cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/SsaImpl.qll b/cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/SsaImpl.qll
index b9f320e57b23..f638abe27e6b 100644
--- a/cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/SsaImpl.qll
+++ b/cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/SsaImpl.qll
@@ -1156,6 +1156,12 @@ class Definition extends SsaImpl::Definition {
     )
   }
 
+  Parameter asParameter() {
+    this.getIndirectionIndex() = 0 and
+    getDefImpl(this).getValue().asInstruction().(InitializeParameterInstruction).getParameter() =
+      result
+  }
+
   /**
    * Gets an `Operand` that represents an indirect use of this definition.
    *