diff --git a/src/tools/bwccmdl.c b/src/tools/bwccmdl.c
index a5bd7b2..b6a8d2b 100644
--- a/src/tools/bwccmdl.c
+++ b/src/tools/bwccmdl.c
@@ -1182,7 +1182,7 @@ printctrl(bwc_gl_ctrl *const control)
   printf("%s", cli_verbose);
 }
 
-static uchar
+static unsigned char
 output_analysis(eas3_data *const ref_data, eas3_data *const org_data)
 {
   /*-----------------------*\
@@ -1531,7 +1531,7 @@ int main(int argc, char *argv[])
           goto OUT;
         }
 
-      if (fwrite(stream->out, sizeof(uchar), size, fp) != size)
+      if (fwrite(stream->out, sizeof(unsigned char), size, fp) != size)
         {
           error_handle = EXIT_FAILURE;
           printf(WRTERROR);
@@ -1576,8 +1576,8 @@ int main(int argc, char *argv[])
       fseek(fp, root, SEEK_SET);
 
       /* Read the compressed data from the input file. */
-      input = calloc(Lfield, sizeof(uchar));
-      if (fread(input, sizeof(uchar), Lfield, fp) != Lfield)
+      input = calloc(Lfield, sizeof(unsigned char));
+      if (fread(input, sizeof(unsigned char), Lfield, fp) != Lfield)
         {
           error_handle = EXIT_FAILURE;
           printf(RDERROR);
@@ -1646,8 +1646,8 @@ int main(int argc, char *argv[])
       fseek(fp, root, SEEK_SET);
 
       /* Read the compressed data from the input file. */
-      input = calloc(Lfield, sizeof(uchar));
-      if (fread(input, sizeof(uchar), Lfield, fp) != Lfield)
+      input = calloc(Lfield, sizeof(unsigned char));
+      if (fread(input, sizeof(unsigned char), Lfield, fp) != Lfield)
         {
           error_handle = EXIT_FAILURE;
           printf(RDERROR);
@@ -1709,8 +1709,8 @@ int main(int argc, char *argv[])
       fseek(fp, root, SEEK_SET);
 
       /* Read the compressed data from the input file. */
-      input = calloc(Lfield, sizeof(uchar));
-      if (fread(input, sizeof(uchar), Lfield, fp) != Lfield)
+      input = calloc(Lfield, sizeof(unsigned char));
+      if (fread(input, sizeof(unsigned char), Lfield, fp) != Lfield)
         {
           error_handle = EXIT_FAILURE;
           printf(RDERROR);