Fix Nim warning
diff --git a/src/bfbs_gen_nim.cpp b/src/bfbs_gen_nim.cpp
index a8f4ee0..25da044 100644
--- a/src/bfbs_gen_nim.cpp
+++ b/src/bfbs_gen_nim.cpp
@@ -77,7 +77,6 @@
            /*filename_extension=*/".nim" };
 }
 
-const std::string Indent = "  ";
 const std::string Export = "*";
 const std::set<std::string> builtin_types = {
   "uint8",   "uint8",  "bool",   "int8",  "uint8",   "int16",