diff --git a/R-package/src/Makevars b/R-package/src/Makevars
index 013eb5a78..59eb9a545 100644
--- a/R-package/src/Makevars
+++ b/R-package/src/Makevars
@@ -3,7 +3,8 @@ export CC  = gcc
 export CXX = g++
 
 # expose these flags to R CMD SHLIB
-PKG_CPPFLAGS = -O3 -Wno-unknown-pragmas  -DXGBOOST_CUSTOMIZE_ERROR_ -fopenmp -fPIC
+PKG_CPPFLAGS = -O3 -Wno-unknown-pragmas  -DXGBOOST_CUSTOMIZE_ERROR_  -fPIC  $(SHLIB_OPENMP_CFLAGS)
+PKG_LIBS = $(SHLIB_OPENMP_CFLAGS)
 
 ifeq ($(no_omp),1)
 	PKG_CPPFLAGS += -D -DDISABLE_OPENMP 
diff --git a/R-package/src/Makevars.win b/R-package/src/Makevars.win
index 013eb5a78..722c75898 100644
--- a/R-package/src/Makevars.win
+++ b/R-package/src/Makevars.win
@@ -3,7 +3,8 @@ export CC  = gcc
 export CXX = g++
 
 # expose these flags to R CMD SHLIB
-PKG_CPPFLAGS = -O3 -Wno-unknown-pragmas  -DXGBOOST_CUSTOMIZE_ERROR_ -fopenmp -fPIC
+PKG_CPPFLAGS = -O3 -Wno-unknown-pragmas  -DXGBOOST_CUSTOMIZE_ERROR_ -fopenmp -fPIC  $(SHLIB_OPENMP_CFLAGS)
+PKG_LIBS = $(SHLIB_OPENMP_CFLAGS)
 
 ifeq ($(no_omp),1)
 	PKG_CPPFLAGS += -D -DDISABLE_OPENMP