diff --git a/src/built_ins.cpp b/src/built_ins.cpp
index f353f54..d2dfa93 100644
--- a/src/built_ins.cpp
+++ b/src/built_ins.cpp
@@ -171,9 +171,6 @@ namespace Slime {
 
     proc load_built_ins_into_environment() -> void* {
         profile_this();
-        String file_name_built_ins = Memory::create_string(__FILE__);
-        defer_free(file_name_built_ins.data);
-
         define_macro((call/cc fun), "TODO") {
             profile_with_name("(call/cc)");
 
diff --git a/src/define_macros.hpp b/src/define_macros.hpp
index 23a3746..d91fd8b 100644
--- a/src/define_macros.hpp
+++ b/src/define_macros.hpp
@@ -109,7 +109,7 @@
 // because the parser relys on being able to temporaily put in markers
 // in the code and also it will fill out the source code location
 #define _define_helper(def, docstring, type, ending)                                               \
-    Parser::parser_file = file_name_built_ins;                                                     \
+    Parser::parser_file = Memory::create_string_no_alloc((char*)__FILE__);                         \
     Parser::parser_line = __LINE__;                                                                \
     Parser::parser_col = 0;                                                                        \
     auto label(params,__LINE__) = Parser::parse_single_expression(#def);                           \
@@ -129,7 +129,7 @@
 #define define_special(def, docs) _define_helper(def, docs, Slime::C_Function_Type::cSpecial,  c_body = []() -> Lisp_Object*)
 #define define_macro(def, docs)   _define_helper(def, docs, Slime::C_Function_Type::cMacro,    c_macro_body = []() -> void)
 
-#define in_caller_env fluid_let(                                \
+#define in_caller_env fluid_let(                               \
         Globals::Current_Execution.envi_stack.next_index,      \
         Globals::Current_Execution.envi_stack.next_index-1)
 
diff --git a/src/forward_decls.cpp b/src/forward_decls.cpp
index 29e49f1..d17e031 100644
--- a/src/forward_decls.cpp
+++ b/src/forward_decls.cpp
@@ -49,6 +49,7 @@ namespace Slime {
         char* get_c_str(String);
         void free_everything();
         String create_string(const char*);
+        String create_string_no_alloc(const char*);
         Lisp_Object* get_symbol(String identifier);
         Lisp_Object* get_symbol(const char*);
         Lisp_Object* get_keyword(String identifier);
diff --git a/src/memory.cpp b/src/memory.cpp
index 115d384..4b1a4f9 100644
--- a/src/memory.cpp
+++ b/src/memory.cpp
@@ -74,6 +74,14 @@ namespace Slime::Memory {
 
     }
 
+    proc create_string_no_alloc(char* str) -> String {
+        String s = {
+            (u32)strlen(str),
+            str
+        };
+        return s;
+    }
+
     proc create_string(const char* str, u32 len) -> String {
         String s = {
             len,