diff --git a/include/tabby/printer.h b/include/tabby/printer.h
index 8c754f6..dc1d3e6 100644
--- a/include/tabby/printer.h
+++ b/include/tabby/printer.h
@@ -36,8 +36,7 @@ typedef struct _tabby_printer_packet {
  */
 int tabby_printer_packet_recv(int fd,
                               tabby_printer_packet *header,
-                              void *body,
-                              uint16_t *checksum);
+                              void *body);
 
 /*
  * For sending printer data packets to a Game Boy Printer
diff --git a/src/printer.c b/src/printer.c
index a1bdd6d..54464dd 100644
--- a/src/printer.c
+++ b/src/printer.c
@@ -26,8 +26,7 @@ static uint16_t checksum(tabby_printer_packet *header, void *body) {
 
 int tabby_printer_packet_recv(int fd,
                               tabby_printer_packet *header,
-                              void *body,
-                              uint16_t *sum) {
+                              void *body) {
     ssize_t len;
 
     size_t i = 0,
@@ -35,9 +34,9 @@ int tabby_printer_packet_recv(int fd,
 
     uint8_t value;
 
-    memset(header, '\0', sizeof(*header));
+    uint16_t sum = 0;
 
-    *sum = 0;
+    memset(header, '\0', sizeof(*header));
 
     while ((len = read(fd, &value, 1)) >= 0) {
         if (i == 0) {
@@ -72,12 +71,12 @@ int tabby_printer_packet_recv(int fd,
         } else if (b < header->size) {
             ((uint8_t *)body)[b++] = value;
         } else if (b == header->size) {
-            *sum = value;
+            sum = value;
             b++;
         } else if (b == header->size + 1) {
-            *sum |= value << 8;
+            sum |= value << 8;
 
-            if (checksum(header, body) != *sum) {
+            if (checksum(header, body) != sum) {
                 errno = EIO;
 
                 goto error_io;