diff --git a/R/vapour-gdal-library.R b/R/vapour-gdal-library.R
index a52b481..dd8a924 100644
--- a/R/vapour-gdal-library.R
+++ b/R/vapour-gdal-library.R
@@ -85,7 +85,7 @@ vapour_srs_wkt <- function(crs) {
 #' @export
 #'
 #' @examples
-#' #vapour_srs_wkt("+proj=longlat")
+#' vapour_srs_wkt("+proj=longlat")
 #' vapour_crs_is_lonlat("+proj=laea +type=crs")
 #' vapour_crs_is_lonlat("+proj=longlat +type=crs")
 #' vapour_crs_is_lonlat("+init=EPSG:4326")
diff --git a/inst/include/gdallibrary/gdallibrary.h b/inst/include/gdallibrary/gdallibrary.h
index 993ffa4..cd202ce 100644
--- a/inst/include/gdallibrary/gdallibrary.h
+++ b/inst/include/gdallibrary/gdallibrary.h
@@ -6,6 +6,9 @@
 #include "CollectorList.h"
 #include "gdalraster/gdalraster.h"
 
+#include <Rinternals.h>
+#include <R.h>
+
 namespace gdallibrary {
 using namespace Rcpp;
 
@@ -657,10 +660,12 @@ inline List gdal_read_geometry(CharacterVector dsn,
 
 
 
-inline CharacterVector gdal_proj_to_wkt(CharacterVector proj_str) {
+inline CharacterVector gdal_proj_to_wkt(SEXP proj_str) {
   OGRSpatialReference oSRS;
   char *pszWKT = nullptr;
-  oSRS.SetFromUserInput(proj_str[0]);
+  const char*  crs_in[] = {CHAR(STRING_ELT(proj_str, 0))};
+  
+  oSRS.SetFromUserInput(*crs_in);
 #if GDAL_VERSION_MAJOR >= 3
   const char *options[3] = { "MULTILINE=YES", "FORMAT=WKT2", NULL };
   OGRErr err = oSRS.exportToWkt(&pszWKT, options);
@@ -668,14 +673,15 @@ inline CharacterVector gdal_proj_to_wkt(CharacterVector proj_str) {
   OGRErr err = oSRS.exportToWkt(&pszWKT);
 #endif
   
-  CharacterVector out; 
+  //CharacterVector out; 
+  SEXP out = PROTECT(Rf_allocVector(STRSXP, 1));
+
   if (err) {
-    out =  Rcpp::CharacterVector::create(NA_STRING);
-    CPLFree(pszWKT);
+    SET_STRING_ELT(out, 0, NA_STRING);
   } else {
-    out =  Rcpp::CharacterVector::create(pszWKT);
+    SET_STRING_ELT(out, 0, Rf_mkChar(pszWKT));
   }
-  
+  UNPROTECT(1); 
   return out;
 }
 
diff --git a/man/vapour_crs_is_lonlat.Rd b/man/vapour_crs_is_lonlat.Rd
index 455ffe5..12564b4 100644
--- a/man/vapour_crs_is_lonlat.Rd
+++ b/man/vapour_crs_is_lonlat.Rd
@@ -16,7 +16,7 @@ logical value \code{TRUE} for lonlat, \code{FALSE} otherwise
 Returns \code{TRUE} if this is longitude latitude data. Missing, malformed, zero-length values are disallowed.
 }
 \examples{
-#vapour_srs_wkt("+proj=longlat")
+vapour_srs_wkt("+proj=longlat")
 vapour_crs_is_lonlat("+proj=laea +type=crs")
 vapour_crs_is_lonlat("+proj=longlat +type=crs")
 vapour_crs_is_lonlat("+init=EPSG:4326")