diff --git a/src/osdep/types.h b/src/osdep/types.h
index 9d0f282..2404ac0 100644
--- a/src/osdep/types.h
+++ b/src/osdep/types.h
@@ -53,6 +53,28 @@
 #endif
 #endif
 
+#if defined(HAVE_LONG_LONG) && !defined(LLONG_MAX)
+#ifdef MAXLLONG
+#define LLONG_MAX MAXLLONG
+#elif SIZEOF_LONG_LONG == 8
+#define LLONG_MAX 9223372036854775807LL
+#elif SIZEOF_LONG_LONG == 4
+#define LLONG_MAX LONG_MAX
+#endif
+#endif
+
+#ifndef OFFT_MAX
+#if defined(HAVE_LONG_LONG) && SIZEOF_OFF_T == SIZEOF_LONG_LONG
+#define OFFT_MAX LLONG_MAX
+#elif SIZEOF_OFF_T == SIZEOF_LONG
+#define OFFT_MAX LONG_MAX
+#elif SIZEOF_OFF_T == SIZEOF_INT
+#define OFFT_MAX INT_MAX
+#elif SIZEOF_OFF_T == SIZEOF_SHORT
+#define OFFT_MAX SHRT_MAX
+#endif
+#endif
+
 #ifndef HAVE_UINT16_T
 #if SIZEOF_CHAR == 2
 typedef unsigned char uint16_t;
diff --git a/src/protocol/ftp/ftp.c b/src/protocol/ftp/ftp.c
index 87ec444..01e301b 100644
--- a/src/protocol/ftp/ftp.c
+++ b/src/protocol/ftp/ftp.c
@@ -1091,7 +1091,7 @@ display_dir_entry(struct cache_entry *cached, off_t *pos, int *tries,
 	add_to_string(&string, "   1 ftp      ftp ");
 
 	if (ftp_info->size != FTP_SIZE_UNKNOWN) {
-		add_format_to_string(&string, "%12lu ", ftp_info->size);
+		add_format_to_string(&string, "%12" OFF_T_FORMAT " ", ftp_info->size);
 	} else {
 		add_to_string(&string, "           - ");
 	}
diff --git a/src/protocol/ftp/parse.c b/src/protocol/ftp/parse.c
index b5caeba..be4326e 100644
--- a/src/protocol/ftp/parse.c
+++ b/src/protocol/ftp/parse.c
@@ -41,10 +41,10 @@
 #define skip_nonspace_end(src, end) \
 	do { while ((src) < (end) && *(src) != ' ') (src)++; } while (0)
 
-static long
-parse_ftp_number(unsigned char **src, unsigned char *end, long from, long to)
+static off_t
+parse_ftp_number(unsigned char **src, unsigned char *end, off_t from, off_t to)
 {
-	long number = 0;
+	off_t number = 0;
 	unsigned char *pos = *src;
 
 	for (; pos < end && isdigit(*pos); pos++)
@@ -104,7 +104,7 @@ parse_ftp_eplf_response(struct ftp_file_info *info, unsigned char *src, int len)
 
 		case FTP_EPLF_SIZE:
 			if (src >= pos) break;
-			info->size = parse_ftp_number(&src, pos, 0, LONG_MAX);
+			info->size = parse_ftp_number(&src, pos, 0, OFFT_MAX);
 			break;
 
 		case FTP_EPLF_MTIME:
@@ -278,7 +278,7 @@ parse_ftp_unix_response(struct ftp_file_info *info, unsigned char *src, int len)
 				break;
 			}
 
-			info->size = parse_ftp_number(&src, pos, 0, LONG_MAX);
+			info->size = parse_ftp_number(&src, pos, 0, OFFT_MAX);
 			break;
 
 		case FTP_UNIX_DAY:
@@ -543,7 +543,7 @@ parse_ftp_winnt_response(struct ftp_file_info *info, unsigned char *src, int len
 	memset(&mtime, 0, sizeof(mtime));
 	mtime.tm_isdst = -1;
 
-	mtime.tm_mon = parse_ftp_number(&src, end, 1, 12);
+	mtime.tm_mon = (int) parse_ftp_number(&src, end, 1, 12);
 	if (src + 2 >= end || *src != '-')
 		return NULL;
 
@@ -587,7 +587,7 @@ parse_ftp_winnt_response(struct ftp_file_info *info, unsigned char *src, int len
 
 	} else if (isdigit(*src)) {
 		info->type = FTP_FILE_PLAINFILE;
-		info->size = parse_ftp_number(&src, end, 0, LONG_MAX);
+		info->size = parse_ftp_number(&src, end, 0, OFFT_MAX);
 		info->permissions = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
 
 	} else {
diff --git a/src/protocol/ftp/parse.h b/src/protocol/ftp/parse.h
index e777398..18cfacd 100644
--- a/src/protocol/ftp/parse.h
+++ b/src/protocol/ftp/parse.h
@@ -19,7 +19,7 @@ struct ftp_file_info {
 	enum ftp_file_type type;	/* File type */
 	struct string name;		/* File name */
 	struct string symlink;		/* Link to which file points */
-	long size;			/* File size. -1 if unknown. */
+	off_t size;			/* File size. -1 if unknown. */
 	time_t mtime;			/* Modification time */
 	unsigned int local_time_zone:1;	/* What format the mtime is in */
 	mode_t permissions;		/* File permissions */