diff --git a/src/Telodendria.c b/src/Telodendria.c
index a8ade89..c6ebd1c 100644
--- a/src/Telodendria.c
+++ b/src/Telodendria.c
@@ -41,6 +41,14 @@
 #include <Matrix.h>
 #include <Db.h>
 
+#ifdef __OpenBSD__
+extern int
+pledge(const char *, const char *);
+
+extern int
+unveil(const char *, const char *);
+#endif
+
 static void
 TelodendriaMemoryHook(MemoryAction a, MemoryInfo * i, void *args)
 {
diff --git a/tools/bin/td b/tools/bin/td
index 43cd83d..1b0a254 100644
--- a/tools/bin/td
+++ b/tools/bin/td
@@ -22,7 +22,7 @@
 : "${TELODENDRIA_VERSION:=0.2.0}"
 : "${CVS_TAG:=Telodendria-$(echo $TELODENDRIA_VERSION | sed 's/\./_/g')}"
 
-: "${DEFINES:=-D_DEFAULT_SOURCE -DTELODENDRIA_VERSION=\"$TELODENDRIA_VERSION\"}"
+: "${DEFINES:=-D_POSIX_C_SOURCE=200809L -DTELODENDRIA_VERSION=\"$TELODENDRIA_VERSION\"}"
 : "${INCLUDES:=-Isrc/include}"
 
 : "${CC:=cc}"