--- src/pipe.cpp	2015-12-20 03:04:02.000000000 +0100
+++ src/pipe.cpp	2018-03-18 17:02:24.834205318 +0100
@@ -83,5 +83,5 @@
 void Pipe::signal()
 {
   // TODO: ignoring return of read/write generates warning; maybe relevant for eventloop work...
-  ::write(_fd_write, '\0', 1);
+  ::write(_fd_write, "\0", 1);
 }