diff --git a/implementations/Nim/Makefile b/implementations/Nim/Makefile
index 756cec1..23c5cc9 100644
--- a/implementations/Nim/Makefile
+++ b/implementations/Nim/Makefile
@@ -2,3 +2,7 @@ SOURCES = defs.nim joy.nim joylib.nim printer.nim reader.nim types.nim utils.nim
 
 joy: $(SOURCES) defs.txt
 	nim c joy.nim
+
+defs.txt: ../defs.txt
+	cp -fv ../defs.txt defs.txt
+