diff --git a/src/predictor/cpu_predictor.cc b/src/predictor/cpu_predictor.cc
index 71481f3a3a08..b0bbeeb16f36 100644
--- a/src/predictor/cpu_predictor.cc
+++ b/src/predictor/cpu_predictor.cc
@@ -254,8 +254,9 @@ class CPUPredictor : public Predictor {
                       int32_t tree_end) const {
     const int threads = omp_get_max_threads();
     constexpr double kDensityThresh = .5;
-    double density = double(p_fmat->Info().num_row_ * p_fmat->Info().num_col_) /
-                     double(p_fmat->Info().num_nonzero_);
+    double density =
+        static_cast<double>(p_fmat->Info().num_row_ * p_fmat->Info().num_col_) /
+        static_cast<double>(p_fmat->Info().num_nonzero_);
     bool blocked = density > kDensityThresh;
 
     std::vector<RegTree::FVec> feat_vecs;