diff --git a/src/arifmetic.cpp b/src/builtin.cpp
similarity index 100%
rename from src/arifmetic.cpp
rename to src/builtin.cpp
diff --git a/src/arifmetic.h b/src/builtin.h
similarity index 100%
rename from src/arifmetic.h
rename to src/builtin.h
diff --git a/src/init.cpp b/src/init.cpp
index 5b8ca99..e3c775f 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -3,7 +3,7 @@
 #include "debug.h"
 #include "object.h"
 #include "globals.h"
-#include "arifmetic.h"
+#include "builtin.h"
 #include "parser/parser.h"
 // We can't include lexical.h before grammatical.h, because of strange errors, but grammatical.h only needs definition of yyscan_t
 #ifndef YY_TYPEDEF_YY_SCANNER_T
@@ -80,7 +80,7 @@ int ParseConfigFile(const char* config)
 }
 
 
-int RegisterArifmeticFunctions()
+int RegisterBuiltinFunctions()
 {
  RegisterFunction("ADD",Arifm_Add);
  RegisterFunction("SUB",Arifm_Sub);
diff --git a/src/init.h b/src/init.h
index 8f34fae..40cb75f 100644
--- a/src/init.h
+++ b/src/init.h
@@ -12,7 +12,7 @@ struct program_options
 
 int ParseOptions(int argc, char** argv, struct program_options& options);
 int ParseConfigFile(const char* config);
-int RegisterArifmeticFunctions();
+int RegisterBuiltinFunctions();
 int BuildDepTree(DepTree* deptree, UsedType& used);
 int CheckFunctions();
 void DumpConfig();
diff --git a/src/main.cpp b/src/main.cpp
index 0987e95..e7c1a3b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -58,7 +58,7 @@ int main(int argc, char** argv)
   COUT(INFO)<<(tot-G_vars.size())<<" removed, "<<G_vars.size()<<" remains."<<std::endl;
  }
 
- RegisterArifmeticFunctions();
+ RegisterBuiltinFunctions();
 
  COUT(INFO)<<"Checking functions ";
  ret=CheckFunctions(); if(ret!=0) { ClearGlobals(); delete DPTree; return 1;}