diff --git a/writeimg.c b/writeimg.c
index ef75026..a65f536 100644
--- a/writeimg.c
+++ b/writeimg.c
@@ -38,7 +38,7 @@ const char help[] =
 
 const char copyright[] = "Copyright (C) %s Imbus, BSD-2-Clause\n";
 
-#define BUFSIZE (4 * 1024 * 1024)
+#define BLOCKSIZE (4 * 1024 * 1024)
 
 struct write_job {
     char  *filename;
@@ -95,8 +95,8 @@ int perform_write(write_job_t *job) {
     lseek(block_fd, 0, SEEK_SET);
     lseek(file_fd, 0, SEEK_SET);
 
-    memset(job->buffer, 0, BUFSIZE);
-    memset(job->buffer2, 0, BUFSIZE);
+    memset(job->buffer, 0, BLOCKSIZE);
+    memset(job->buffer2, 0, BLOCKSIZE);
 
     while (1) {
         ssize_t read_file = read(file_fd, job->buffer2, job->block_size);
@@ -181,11 +181,11 @@ int main(int argc, char *argv[]) {
 
     printf("Writing %s to %s\n", wjob.filename, wjob.dev_name);
 
-    wjob.buffer = malloc(BUFSIZE);
-    wjob.buffer2 = malloc(BUFSIZE);
+    wjob.buffer = malloc(BLOCKSIZE);
+    wjob.buffer2 = malloc(BLOCKSIZE);
 
-    wjob.bufsize = BUFSIZE;
-    wjob.block_size = BUFSIZE;
+    wjob.bufsize = BLOCKSIZE;
+    wjob.block_size = BLOCKSIZE;
 
     perform_write(&wjob);