diff --git a/src/nix-worker/main.cc b/src/nix-worker/main.cc
index acb4be135..c8abe1429 100644
--- a/src/nix-worker/main.cc
+++ b/src/nix-worker/main.cc
@@ -18,6 +18,11 @@
 using namespace nix;
 
 
+#ifndef SIGPOLL
+#define SIGPOLL SIGIO
+#endif
+
+
 static Path readStorePath(Source & from)
 {
     Path path = readString(from);