diff --git a/code/sys/sys_unix.c b/code/sys/sys_unix.c
index 7dfcd563..607d0f21 100644
--- a/code/sys/sys_unix.c
+++ b/code/sys/sys_unix.c
@@ -123,7 +123,7 @@ qboolean Sys_RandomBytes( byte *string, int len )
 	if( !fp )
 		return qfalse;
 
-	if( !fread( string, sizeof( byte ), len, fp ) )
+	if( fread( string, sizeof( byte ), len, fp ) != len )
 	{
 		fclose( fp );
 		return qfalse;