diff --git a/src/main.c b/src/main.c
index bda7f2b19..ffe6ba854 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2427,11 +2427,11 @@ void dump(const char *text,
     /* without the hex output, we can fit more on screen */
     width = 0x40;
 
-  fprintf(stream, "%s, %d bytes (0x%x)\n", text, size, size);
+  fprintf(stream, "%s, %zd bytes (0x%zx)\n", text, size, size);
 
   for(i=0; i<size; i+= width) {
 
-    fprintf(stream, "%04x: ", i);
+    fprintf(stream, "%04zx: ", i);
 
     if(!nohex) {
       /* hex not disabled, show it */