diff --git a/R-package/src/xgboost_R.cpp b/R-package/src/xgboost_R.cpp
index 0f40ad848..1d426c496 100644
--- a/R-package/src/xgboost_R.cpp
+++ b/R-package/src/xgboost_R.cpp
@@ -39,7 +39,7 @@ double LogGamma(double v) {
 
 namespace random {
 void Seed(unsigned seed) {
-  //warning("parameter seed is ignored, please set random seed using set.seed");
+  //  warning("parameter seed is ignored, please set random seed using set.seed");
 }
 double Uniform(void) {
   return unif_rand();