diff --git a/convert_geotiff.c b/convert_geotiff.c
index e0399f9..d4c4da3 100644
--- a/convert_geotiff.c
+++ b/convert_geotiff.c
@@ -83,7 +83,7 @@ int main (int argc, char * argv[]) {
   
   int c,i,j;
   int categorical_range,border_width,word_size,isigned,tile_size;
-  float scale,missing,missing0;
+  float scale,missing;
   GeogridIndex idx;
   char units[STRING_LENGTH],description[STRING_LENGTH],filename[STRING_LENGTH];
   TIFF *file;
@@ -98,7 +98,7 @@ int main (int argc, char * argv[]) {
   strcpy(description,"\"NO DESCRIPTION\"");
   categorical_range=0;
   tile_size=100;
-  missing0=0.;
+  missing=0;
   
   /* parse options */
   while ( (c = getopt(argc, argv, "hzs:c:b:w:t:m:u:d:") ) != -1) {
diff --git a/geogrid_tiles.c b/geogrid_tiles.c
index eb19db2..e575e63 100644
--- a/geogrid_tiles.c
+++ b/geogrid_tiles.c
@@ -224,8 +224,7 @@ void write_tile(
   float *arr              /* tile data buffer */
                 )
 {
-  int itx,ity,isgn,endian,nx,ny,nz,i,j;
-  float swp;
+  int itx,ity,isgn,endian,nx,ny,nz;
   
   /* get global index for construction tile file name */
   itx=itile_x*idx.tx+1;
diff --git a/read_geotiff.c b/read_geotiff.c
index 7fbf354..45650ad 100644
--- a/read_geotiff.c
+++ b/read_geotiff.c
@@ -47,7 +47,7 @@ GeogridIndex get_index_from_geotiff(
   int projid,count;
   short modeltype;
   GeogridIndex idx;
-  double stdpar1,stdpar2,stdlon,olat,olon,dx,dy;
+  double stdpar1,stdpar2,stdlon,olat,olon;
   double pixelscale[3];
   uint32 inx,iny,inz;
   uint16 orientation,format;