diff --git a/src/tree/updater_approx.cc b/src/tree/updater_approx.cc
index 68317fc41..781c2dcf4 100644
--- a/src/tree/updater_approx.cc
+++ b/src/tree/updater_approx.cc
@@ -52,7 +52,7 @@ auto BatchSpec(TrainParam const &p, common::Span<float> hess) {
 }
 }  // anonymous namespace
 
-class GloablApproxBuilder {
+class GlobalApproxBuilder {
  protected:
   TrainParam const *param_;
   HistMakerTrainParam const *hist_param_{nullptr};
@@ -161,7 +161,7 @@ class GloablApproxBuilder {
   }
 
  public:
-  explicit GloablApproxBuilder(TrainParam const *param, HistMakerTrainParam const *hist_param,
+  explicit GlobalApproxBuilder(TrainParam const *param, HistMakerTrainParam const *hist_param,
                                MetaInfo const &info, Context const *ctx,
                                std::shared_ptr<common::ColumnSampler> column_sampler,
                                ObjInfo const *task, common::Monitor *monitor)
@@ -248,7 +248,7 @@ class GloablApproxBuilder {
 class GlobalApproxUpdater : public TreeUpdater {
   common::Monitor monitor_;
   // specializations for different histogram precision.
-  std::unique_ptr<GloablApproxBuilder> pimpl_;
+  std::unique_ptr<GlobalApproxBuilder> pimpl_;
   // pointer to the last DMatrix, used for update prediction cache.
   DMatrix *cached_{nullptr};
   std::shared_ptr<common::ColumnSampler> column_sampler_;
@@ -289,7 +289,7 @@ class GlobalApproxUpdater : public TreeUpdater {
     if (!column_sampler_) {
       column_sampler_ = common::MakeColumnSampler(ctx_);
     }
-    pimpl_ = std::make_unique<GloablApproxBuilder>(param, &hist_param_, m->Info(), ctx_,
+    pimpl_ = std::make_unique<GlobalApproxBuilder>(param, &hist_param_, m->Info(), ctx_,
                                                    column_sampler_, task_, &monitor_);
 
     linalg::Matrix<GradientPair> h_gpair;