diff --git a/package/src/RcompGeomete.c b/package/src/RcompGeomete.c
index 389c168..96859fe 100644
--- a/package/src/RcompGeomete.c
+++ b/package/src/RcompGeomete.c
@@ -81,7 +81,7 @@ double *calculateradill(double *point0, double *voronoiVertices)
 	
 	Rprintf("num of rows");
 	snprintf(int2strbuf, int2strbufsize, "%d", row);
-	Rprintf(int2strbuf);
+	Rprintf((char *)int2strbuf);
 	
 	for (j = 0; j < row; j++)
 	{
diff --git a/package/src/Rdelaunayn.c b/package/src/Rdelaunayn.c
index 73a0696..1c68f9b 100644
--- a/package/src/Rdelaunayn.c
+++ b/package/src/Rdelaunayn.c
@@ -325,7 +325,7 @@ SEXP C_delaunayn(const SEXP p, const SEXP options, SEXP tmpdir)
   {
     if (exitcode == 1)
     {
-      error("Qhull returned non-simplicial facets -- try delaunayn with different options. exitcode", exitcode);
+      error("Qhull returned non-simplicial facets -- try delaunayn with different options. exitcode %d", exitcode);
     }
     else
     {
diff --git a/package/src/Rvoronoi.c b/package/src/Rvoronoi.c
index 9a261cd..ee4c3f8 100644
--- a/package/src/Rvoronoi.c
+++ b/package/src/Rvoronoi.c
@@ -492,7 +492,7 @@ SEXP C_voronoiR(const SEXP p, const SEXP options, SEXP tmpdir)
   {
     if (exitcode == 1)
     {
-      error("Qhull returned non-simplicial facets -- try delaunayn with different options. exitcode", exitcode);
+      error("Qhull returned non-simplicial facets -- try delaunayn with different options. exitcode %d", exitcode);
     }
     else
     {