diff --git a/ncdump/chunkspec.c b/ncdump/chunkspec.c
index 909e3ee07..06fb5ffb9 100644
--- a/ncdump/chunkspec.c
+++ b/ncdump/chunkspec.c
@@ -196,7 +196,7 @@ dimchunkspec_size(int indimid) {
 /* Return number of dimensions for which chunking was specified in
  * chunkspec string on command line, 0 if no chunkspec string was
  * specified. */
-int
+size_t
 dimchunkspec_ndims(void) {
     return dimchunkspecs.ndims;
 }
diff --git a/ncdump/chunkspec.h b/ncdump/chunkspec.h
index 8e2f9f06c..06ab65a86 100644
--- a/ncdump/chunkspec.h
+++ b/ncdump/chunkspec.h
@@ -6,6 +6,9 @@
 #ifndef _CHUNKSPEC_H_
 #define _CHUNKSPEC_H_
 
+#include <stddef.h>
+#include "utils.h"
+
 /* Parse chunkspec string and convert into internal data structure,
  * associating dimids from open file or group specified by ncid with
  * corresponding chunk sizes */
@@ -25,7 +28,7 @@ dimchunkspec_exists(int indimid);
 /* Return number of dimensions for which chunking was specified in
  * chunkspec string on command line, 0 if no chunkspec string was
  * specified. */
-extern int
+extern size_t
 dimchunkspec_ndims(void);
 
 /* Return whether chunking should be omitted, due to explicit
diff --git a/ncdump/dumplib.c b/ncdump/dumplib.c
index 8956fab47..e5842e532 100644
--- a/ncdump/dumplib.c
+++ b/ncdump/dumplib.c
@@ -1806,7 +1806,7 @@ print_type_name(int locid, int typeid) {
 static int
 init_is_unlim(int ncid, int **is_unlim_p)
 {
-    int num_grps;	 /* total number of groups */
+    size_t num_grps;	 /* total number of groups */
     int max_dimid = -1;    /* maximum dimid across whole dataset */
     int *grpids = NULL;	 /* temporary list of all grpids */
     int igrp;
@@ -1822,7 +1822,7 @@ init_is_unlim(int ncid, int **is_unlim_p)
 	return NC_EBADGRPID;
     /* Now ncid is root group.  Get total number of groups and their ids */
     NC_CHECK( nc_inq_grps_full(ncid, &num_grps, NULL) );
-    grpids = emalloc((size_t)(num_grps + 1) * sizeof(int));
+    grpids = emalloc((num_grps + 1) * sizeof(int));
     NC_CHECK( nc_inq_grps_full(ncid, &num_grps, grpids) );
 #define DONT_INCLUDE_PARENTS 0
     /* Get all dimensions in groups and info about which ones are unlimited */
diff --git a/ncdump/nccopy.c b/ncdump/nccopy.c
index 190696d72..21306269a 100644
--- a/ncdump/nccopy.c
+++ b/ncdump/nccopy.c
@@ -681,14 +681,14 @@ static int
 copy_groups(int iroot, int oroot)
 {
     int stat = NC_NOERR;
-    int numgrps;
+    size_t numgrps;
     int *grpids;
     int i;
 
     /* get total number of groups and their ids, including all descendants */
     NC_CHECK(nc_inq_grps_full(iroot, &numgrps, NULL));
     if(numgrps > 1) {		/* there's always 1 root group */
-	grpids = emalloc((size_t)numgrps * sizeof(int));
+	grpids = emalloc(numgrps * sizeof(int));
 	NC_CHECK(nc_inq_grps_full(iroot, NULL, grpids));
 	/* create corresponding new groups in ogrp, except for root group */
 	for(i = 1; i < numgrps; i++) {
diff --git a/ncdump/utils.c b/ncdump/utils.c
index c32d49b95..ab19af3cb 100644
--- a/ncdump/utils.c
+++ b/ncdump/utils.c
@@ -520,7 +520,7 @@ nc_inq_grpname_count(int ncid, int igrp, char **lgrps, idnode_t *grpids) {
 /* Check if any group names specified with "-g grp1,...,grpn" are
  * missing.  Returns total number of matching groups if no missing
  * groups detected, otherwise exits. */
-int
+size_t
 grp_matches(int ncid, int nlgrps, char** lgrps, idnode_t *grpids) {
     int ig;
     size_t total = 0;
@@ -883,7 +883,7 @@ nc_free_giter(ncgiter_t *iterp)
  * for the group ids, then call again to get them.
  */
 int
-nc_inq_grps_full(int rootid, int *numgrps, int *grpids) 
+nc_inq_grps_full(int rootid, size_t *numgrps, int *grpids)
 {
     int stat = NC_NOERR;
     ncgiter_t *giter;		/* pointer to group iterator */
diff --git a/ncdump/utils.h b/ncdump/utils.h
index cd413e39a..a38dfae00 100644
--- a/ncdump/utils.h
+++ b/ncdump/utils.h
@@ -128,7 +128,7 @@ extern bool_t	idmember ( const idnode_t* idlist, int id );
 extern bool_t	group_wanted ( int grpid, int nlgrps, const idnode_t* grpids );
 
 /* Check group list for missing groups */
-extern int grp_matches(int ncid, int nlgrps, char** lgrps, idnode_t *grpids);
+extern size_t grp_matches(int ncid, int nlgrps, char** lgrps, idnode_t *grpids);
 
 /* Returns 1 if string s1 ends with string s2, 0 otherwise. */
 extern int strendswith(const char *s1, const char *s2);
@@ -162,7 +162,7 @@ extern void freeidlist(idnode_t *idlist);
  * loses information about subgroup relationships, just flattening all
  * groups into a serial list.
  */
-extern int nc_inq_grps_full(int ncid, int *numgrps, int *ncids);
+extern int nc_inq_grps_full(int ncid, size_t *numgrps, int *ncids);
 
 /* 
  * More complex iterator interface: get group iterator for start group