diff --git a/include/revng-c/DataLayoutAnalysis/DLATypeSystem.h b/include/revng-c/DataLayoutAnalysis/DLATypeSystem.h
index b70a76176..d9a19dbd2 100644
--- a/include/revng-c/DataLayoutAnalysis/DLATypeSystem.h
+++ b/include/revng-c/DataLayoutAnalysis/DLATypeSystem.h
@@ -14,6 +14,7 @@
 #include <set>
 #include <utility>
 
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/GraphTraits.h"
 #include "llvm/ADT/IntEqClasses.h"
 #include "llvm/ADT/SmallSet.h"
@@ -332,7 +333,7 @@ public:
   }
 
 public:
-  void mergeNodes(const std::vector<LayoutTypeSystemNode *> &ToMerge);
+  void mergeNodes(llvm::ArrayRef<LayoutTypeSystemNode *> ToMerge);
 
   void removeNode(LayoutTypeSystemNode *N);
 
diff --git a/lib/DataLayoutAnalysis/DLATypeSystem.cpp b/lib/DataLayoutAnalysis/DLATypeSystem.cpp
index 3ec4c8583..704fbc14b 100644
--- a/lib/DataLayoutAnalysis/DLATypeSystem.cpp
+++ b/lib/DataLayoutAnalysis/DLATypeSystem.cpp
@@ -5,6 +5,7 @@
 #include <algorithm>
 #include <string>
 
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SCCIterator.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
@@ -281,10 +282,13 @@ static void fixPredSucc(LayoutTypeSystemNode *From,
 
 static Logger<> MergeLog("dla-merge-nodes");
 
-using LayoutTypeSystemNodePtrVec = std::vector<LayoutTypeSystemNode *>;
+void LayoutTypeSystem::mergeNodes(llvm::ArrayRef<LayoutTypeSystemNode *>
+                                    ToMerge) {
+  revng_assert(ToMerge.size() > 0ULL);
+  // If we're merging just one node there's nothing to do.
+  if (ToMerge.size() <= 1ULL)
+    return;
 
-void LayoutTypeSystem::mergeNodes(const LayoutTypeSystemNodePtrVec &ToMerge) {
-  revng_assert(ToMerge.size() > 1ULL);
   LayoutTypeSystemNode *Into = ToMerge[0];
   const unsigned IntoID = Into->ID;