diff --git a/ar.c b/ar.c
index 59f5181..d666719 100644
--- a/ar.c
+++ b/ar.c
@@ -31,7 +31,7 @@
 
 typedef struct ar_headers_s {
 	char *name;
-	size_t size;
+	off_t size;
 	uid_t uid;
 	gid_t gid;
 	mode_t mode;
@@ -90,7 +90,7 @@
 			/* dont worry about adding the last '\n', we dont need it now */
 		}
 		
-		entry->size = (size_t) atoi(raw_ar_header.size);
+		entry->size = (off_t) atoi(raw_ar_header.size);
 		/* long filenames have '/' as the first character */
 		if (raw_ar_header.name[0] == '/') {
 			if (raw_ar_header.name[1] == '/') {
@@ -211,7 +211,7 @@
 		}
 		if ((funct & extract_to_file) || (funct & extract_to_stdout)) {
 			lseek(srcFd, extract_list->offset, SEEK_SET);
-			copy_file_chunk(srcFd, dstFd, (size_t) extract_list->size);			
+			copy_file_chunk(srcFd, dstFd, (off_t) extract_list->size);			
 		}
 		if (funct & verbose) {
 			printf("%s %d/%d %8d %s ", mode_string(extract_list->mode), 
diff --git a/archival/ar.c b/archival/ar.c
index 59f5181..d666719 100644
--- a/archival/ar.c
+++ b/archival/ar.c
@@ -31,7 +31,7 @@
 
 typedef struct ar_headers_s {
 	char *name;
-	size_t size;
+	off_t size;
 	uid_t uid;
 	gid_t gid;
 	mode_t mode;
@@ -90,7 +90,7 @@
 			/* dont worry about adding the last '\n', we dont need it now */
 		}
 		
-		entry->size = (size_t) atoi(raw_ar_header.size);
+		entry->size = (off_t) atoi(raw_ar_header.size);
 		/* long filenames have '/' as the first character */
 		if (raw_ar_header.name[0] == '/') {
 			if (raw_ar_header.name[1] == '/') {
@@ -211,7 +211,7 @@
 		}
 		if ((funct & extract_to_file) || (funct & extract_to_stdout)) {
 			lseek(srcFd, extract_list->offset, SEEK_SET);
-			copy_file_chunk(srcFd, dstFd, (size_t) extract_list->size);			
+			copy_file_chunk(srcFd, dstFd, (off_t) extract_list->size);			
 		}
 		if (funct & verbose) {
 			printf("%s %d/%d %8d %s ", mode_string(extract_list->mode), 
diff --git a/libbb/copy_file_chunk.c b/libbb/copy_file_chunk.c
index 3c657dd..bf0b06e 100644
--- a/libbb/copy_file_chunk.c
+++ b/libbb/copy_file_chunk.c
@@ -32,9 +32,9 @@
 /*
  * Copy chunksize bytes between two file descriptors
  */
-int copy_file_chunk(int srcfd, int dstfd, size_t chunksize)
+int copy_file_chunk(int srcfd, int dstfd, off_t chunksize)
 {
-        size_t size;
+        off_t size;
         char buffer[BUFSIZ]; /* BUFSIZ is declared in stdio.h */
 
         while (chunksize > 0) {