diff --git a/Cargo.toml b/Cargo.toml
index 68406ca..57be909 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 backend_c = []
 backend_node = []
 
-default = ["backend_node"]
+default = ["backend_c"]
 
 [dependencies]
 structopt = "0.3.21"
diff --git a/builtin/builtin.c b/builtin/builtin.c
index 14e60e7..5c9ab03 100644
--- a/builtin/builtin.c
+++ b/builtin/builtin.c
@@ -1,7 +1,7 @@
 /* START builtins */
 #include "stdio.h"
 
-void _printf(msg)
+void _printf(char *msg)
 {
     printf(msg);
 }
diff --git a/examples/playground.sb b/examples/playground.sb
index 18ec2f4..584e33e 100644
--- a/examples/playground.sb
+++ b/examples/playground.sb
@@ -1,2 +1,3 @@
 fn main(n: int) {
+    _printf("Hello World!\n")
 }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index f42c866..9c97f71 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -59,13 +59,17 @@ fn main() -> Result<(), String> {
     let mut file = File::open(in_file).expect("Could not open file");
     let mut contents = String::new();
 
-    contents = append_stdlib(contents);
-
     file.read_to_string(&mut contents)
         .expect("Could not read file");
-
     let tokens = lexer::tokenize(&contents);
-    let program = parser::parse(tokens, Some(contents))?;
+    let mut program = parser::parse(tokens, Some(contents))?;
+
+    // C Backend currently does not support stdlib yet, since not all features are implemented
+    #[cfg(features = "backend_node")]
+    {
+        let stdlib = build_stdlib();
+        program.merge_with(stdlib);
+    }
 
     let output = generator::generate(program);
     let mut file = std::fs::File::create(out_file).expect("create failed");
@@ -74,13 +78,12 @@ fn main() -> Result<(), String> {
     Ok(())
 }
 
-fn append_stdlib(mut buffer: String) -> String {
-    buffer += "// START stdlib\n\n";
-
-    let stdlib = Lib::get("stdio.sb").expect("Standard library not found. This should not occur.");
-    buffer += std::str::from_utf8(&stdlib).expect("Could not interpret standard library.");
-
-    buffer += "\n// END stdlib\n\n";
+fn build_stdlib() -> parser::node_type::Program {
+    let stdlib_raw =
+        Lib::get("stdio.sb").expect("Standard library not found. This should not occur.");
+    let stblib_str =
+        std::str::from_utf8(&stdlib_raw).expect("Could not interpret standard library.");
+    let stdlib_tokens = lexer::tokenize(&stblib_str);
 
-    buffer
+    parser::parse(stdlib_tokens, Some(stblib_str.into())).expect("Could not parse stdlib")
 }
diff --git a/src/parser/node_type.rs b/src/parser/node_type.rs
index 8f81c1a..4548ad2 100644
--- a/src/parser/node_type.rs
+++ b/src/parser/node_type.rs
@@ -22,6 +22,13 @@ pub struct Program {
     pub globals: Vec<String>,
 }
 
+impl Program {
+    pub fn merge_with(&mut self, mut other: Program) {
+        self.func.append(&mut other.func);
+        self.globals.append(&mut other.globals)
+    }
+}
+
 #[derive(Debug)]
 pub struct Function {
     pub name: String,