diff --git a/include/libbb.h b/include/libbb.h
index 750e0bb4f..a6d9a510b 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -267,7 +267,8 @@ enum {
 	MEGABYTE = (KILOBYTE*1024),
 	GIGABYTE = (MEGABYTE*1024)
 };
-const char *make_human_readable_str(unsigned long size, unsigned long block_size, unsigned long display_unit);
+const char *make_human_readable_str(unsigned long long size, 
+		unsigned long block_size, unsigned long display_unit);
 
 int bb_ask_confirmation(void);
 int klogctl(int type, char * b, int len);
diff --git a/libbb/human_readable.c b/libbb/human_readable.c
index 7bdad36a9..656889150 100644
--- a/libbb/human_readable.c
+++ b/libbb/human_readable.c
@@ -28,9 +28,8 @@
 #include <stdio.h>
 #include "libbb.h"
 
-const char *make_human_readable_str(unsigned long size, 
-									unsigned long block_size,
-									unsigned long display_unit)
+const char *make_human_readable_str(unsigned long long size, 
+	unsigned long block_size, unsigned long display_unit)
 {
 	/* The code will adjust for additional (appended) units. */
 	static const char zero_and_units[] = { '0', 0, 'k', 'M', 'G', 'T' };
@@ -48,7 +47,7 @@ const char *make_human_readable_str(unsigned long size,
 	f = fmt;
 	frac = 0;
 
-	val = ((unsigned long long) size) * block_size;
+	val = size * block_size;
 	if (val == 0) {
 		return u;
 	}