diff --git a/daemon/remote.c b/daemon/remote.c
index 39dc9e765..0fb4d7ceb 100644
--- a/daemon/remote.c
+++ b/daemon/remote.c
@@ -172,7 +172,9 @@ strlmem( char * buf, int64_t bytes, size_t buflen )
 static char*
 strlsize( char * buf, int64_t bytes, size_t buflen )
 {
-    if( !bytes )
+    if( bytes < 1 )
+        tr_strlcpy( buf, "Unknown", buflen );
+    else if( !bytes )
         tr_strlcpy( buf, "None", buflen );
     else
         tr_formatter_size_B( buf, bytes, buflen );
diff --git a/libtransmission/utils.c b/libtransmission/utils.c
index b6cd13de7..2df7e66b8 100644
--- a/libtransmission/utils.c
+++ b/libtransmission/utils.c
@@ -1659,7 +1659,7 @@ tr_realpath( const char * path, char * resolved_path )
 struct formatter_unit
 {
     char * name;
-    uint64_t value;
+    int64_t value;
 };
 
 struct formatter_units
@@ -1694,7 +1694,7 @@ formatter_init( struct formatter_units * units,
 
 static char*
 formatter_get_size_str( const struct formatter_units * u,
-                        char * buf, uint64_t bytes, size_t buflen )
+                        char * buf, int64_t bytes, size_t buflen )
 {
     int precision;
     double value;
@@ -1729,7 +1729,7 @@ tr_formatter_size_init( unsigned int kilo,
 }
 
 char*
-tr_formatter_size_B( char * buf, uint64_t bytes, size_t buflen )
+tr_formatter_size_B( char * buf, int64_t bytes, size_t buflen )
 {
     return formatter_get_size_str( &size_units, buf, bytes, buflen );
 }
@@ -1784,7 +1784,7 @@ tr_formatter_mem_init( unsigned int kilo,
 }
 
 char*
-tr_formatter_mem_B( char * buf, uint64_t bytes_per_second, size_t buflen )
+tr_formatter_mem_B( char * buf, int64_t bytes_per_second, size_t buflen )
 {
     return formatter_get_size_str( &mem_units, buf, bytes_per_second, buflen );
 }
diff --git a/libtransmission/utils.h b/libtransmission/utils.h
index ea592aa05..826d866a5 100644
--- a/libtransmission/utils.h
+++ b/libtransmission/utils.h
@@ -585,13 +585,13 @@ extern unsigned int tr_size_K;
 char* tr_formatter_speed_KBps( char * buf, double KBps, size_t buflen );
 
 /* format a memory size from bytes into a user-readable string. */
-char* tr_formatter_mem_B( char * buf, uint64_t bytes, size_t buflen );
+char* tr_formatter_mem_B( char * buf, int64_t bytes, size_t buflen );
 
 /* format a memory size from MB into a user-readable string. */
 static inline char* tr_formatter_mem_MB( char * buf, double MBps, size_t buflen ) { return tr_formatter_mem_B( buf, MBps * tr_mem_K * tr_mem_K, buflen ); }
 
 /* format a file size from bytes into a user-readable string. */
-char* tr_formatter_size_B( char * buf, uint64_t bytes, size_t buflen );
+char* tr_formatter_size_B( char * buf, int64_t bytes, size_t buflen );
 
 void tr_formatter_get_units( struct tr_benc * dict );