diff --git a/H/pl-incl.h b/H/pl-incl.h
index a24ac4cdb..ce5e4ed4f 100755
--- a/H/pl-incl.h
+++ b/H/pl-incl.h
@@ -36,6 +36,10 @@
 #define O_PLMT 1
 #endif
 
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
 #include "Yap.h"
 #include "YapHeap.h"