diff --git a/core/fmt/fmt.odin b/core/fmt/fmt.odin
index 81fa8b2e8..3f258f15a 100644
--- a/core/fmt/fmt.odin
+++ b/core/fmt/fmt.odin
@@ -226,7 +226,9 @@ wprint :: proc(w: io.Writer, args: ..any, sep := " ") -> int {
 		fmt_value(&fi, args[i], 'v');
 	}
 	io.flush(auto_cast w);
-	return int(io.size(auto_cast w) - size0);
+
+	size1 := io.size(auto_cast w);
+	return int(size1 - size0);
 }
 
 wprintln :: proc(w: io.Writer, args: ..any, sep := " ") -> int {
@@ -244,7 +246,9 @@ wprintln :: proc(w: io.Writer, args: ..any, sep := " ") -> int {
 	}
 	io.write_byte(fi.writer, '\n');
 	io.flush(auto_cast w);
-	return int(io.size(auto_cast w) - size0);
+
+	size1 := io.size(auto_cast w);
+	return int(size1 - size0);
 }
 
 wprintf :: proc(w: io.Writer, fmt: string, args: ..any) -> int {
@@ -521,7 +525,9 @@ wprintf :: proc(w: io.Writer, fmt: string, args: ..any) -> int {
 	}
 
 	io.flush(auto_cast w);
-	return int(io.size(auto_cast w) - size0);
+
+	size1 := io.size(auto_cast w);
+	return int(size1 - size0);
 }
 
 wprint_type :: proc(w: io.Writer, info: ^runtime.Type_Info) -> int {
diff --git a/core/os/os_linux.odin b/core/os/os_linux.odin
index d7cd291e1..517570686 100644
--- a/core/os/os_linux.odin
+++ b/core/os/os_linux.odin
@@ -362,9 +362,9 @@ seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {
 file_size :: proc(fd: Handle) -> (i64, Errno) {
 	s, err := _fstat(fd);
 	if err != ERROR_NONE {
-		return -1, err;
+		return 0, err;
 	}
-	return s.size, ERROR_NONE;
+	return max(s.size, 0), ERROR_NONE;
 }
 
 
@@ -459,7 +459,7 @@ _rewinddir :: inline proc(dirp: Dir) {
 _readdir :: inline proc(dirp: Dir) -> (entry: Dirent, err: Errno, end_of_stream: bool) {
 	result: ^Dirent;
 	rc := _unix_readdir_r(dirp, &entry, &result);
-	
+
 	if rc != 0 {
 		err = Errno(get_last_error());
 		return;
@@ -502,9 +502,9 @@ absolute_path_from_handle :: proc(fd: Handle) -> (string, Errno) {
 	buf : [256]byte;
 	fd_str := strconv.itoa( buf[:], cast(int)fd );
 
-	procfs_path := strings.concatenate( []string{ "/proc/self/fd/", fd_str } ); 
+	procfs_path := strings.concatenate( []string{ "/proc/self/fd/", fd_str } );
 	defer delete(procfs_path);
-	
+
 	return _readlink(procfs_path);
 }