diff --git a/src/util.cpp b/src/util.cpp
index 0e391862..b92dc058 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -16,10 +16,10 @@
 // along with icd9. If not, see <http://www.gnu.org/licenses/>.
 
 // [[Rcpp::interfaces(r, cpp)]]
+#include <Rcpp.h>
 #include <Rinternals.h>
 #include <vector>
 #include <string>
-#include <Rcpp.h>
 #ifdef _OPENMP
 #include <omp.h>
 #endif