diff --git a/implementations/Nim/defs.txt b/implementations/Nim/defs.txt
index 3b96c53..570293f 100644
--- a/implementations/Nim/defs.txt
+++ b/implementations/Nim/defs.txt
@@ -16,7 +16,6 @@ at drop first
 average [sum] [size] cleave /
 b [i] dip i
 binary unary popd
-bool truthy
 ccccons ccons ccons
 ccons cons cons
 clear [] swaack pop
diff --git a/implementations/Nim/simplejoy.nim b/implementations/Nim/joy.nim
similarity index 99%
rename from implementations/Nim/simplejoy.nim
rename to implementations/Nim/joy.nim
index cd9152f..5500e27 100644
--- a/implementations/Nim/simplejoy.nim
+++ b/implementations/Nim/joy.nim
@@ -552,7 +552,7 @@ proc joy_eval(sym: string, stack: JoyListType, expression: JoyListType,
     return swaack(stack, expression, dictionary)
   of "swap":
     return swap(stack, expression, dictionary)
-  of "truthy":
+  of "bool":  # bool is a reserved word in Nim.
     return truthy(stack, expression, dictionary)
 
   else: