diff --git a/c2logic/compiler.py b/c2logic/compiler.py
index 5d684ff..aa8ffd5 100644
--- a/c2logic/compiler.py
+++ b/c2logic/compiler.py
@@ -415,7 +415,10 @@ class Compiler(c_ast.NodeVisitor):
 		self.push(RelativeJump(self.loops[-1].start, JumpCondition.always))
 	
 	def visit_Return(self, node):
-		self.visit(node.expr)
+		if node.expr is None:
+			self.push(Set("__rax","null"))
+		else:	
+			self.visit(node.expr)
 		self.push_ret()
 	
 	def visit_Label(self, node):
diff --git a/include/io.h b/include/io.h
new file mode 100644
index 0000000..1caa69d
--- /dev/null
+++ b/include/io.h
@@ -0,0 +1,11 @@
+#ifndef IO_H
+#define IO_H
+void println(char* s) {
+	print(s);
+	print("\n");
+}
+void printdln(double s) {
+	printd(s);
+	print("\n");
+}
+#endif
\ No newline at end of file