diff --git a/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp b/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
--- a/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
@@ -164,7 +164,7 @@
     $_reader.emitError("size mismatch for operand/result_segment_size");
     return ::mlir::failure();
   }
-  llvm::copy(::llvm::ArrayRef<int32_t>(attr), $_storage.begin());
+  ::llvm::copy(::llvm::ArrayRef<int32_t>(attr), $_storage.begin());
 } else {
   return $_reader.readSparseArray(::llvm::MutableArrayRef($_storage));
 }
diff --git a/mlir/tools/mlir-tblgen/OpFormatGen.cpp b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
--- a/mlir/tools/mlir-tblgen/OpFormatGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
@@ -1706,7 +1706,7 @@
         body << "1";
     };
     if (op.getDialect().usePropertiesForAttributes()) {
-      body << "llvm::copy(ArrayRef<int32_t>({";
+      body << "::llvm::copy(::llvm::ArrayRef<int32_t>({";
       llvm::interleaveComma(op.getResults(), body, interleaveFn);
       body << formatv("}), "
                       "result.getOrAddProperties<{0}::Properties>()."