diff --git a/tools/bin/td b/tools/bin/td
index 6df3464..a41287c 100644
--- a/tools/bin/td
+++ b/tools/bin/td
@@ -22,7 +22,7 @@
 : "${TELODENDRIA_VERSION:=0.0.0}"
 : "${CVS_TAG:=Telodendria-$(echo $TELODENDRIA_VERSION | sed 's/\./_/g')}"
 
-: "${DEFINES:=-DTELODENDRIA_VERSION=\"$TELODENDRIA_VERSION\"}"
+: "${DEFINES:=-D_DEFAULT_SOURCE -DTELODENDRIA_VERSION=\"$TELODENDRIA_VERSION\"}"
 : "${INCLUDES:=-Isrc/include}"
 
 : "${CC:=cc}"