diff --git a/src/ast.cpp b/src/ast.cpp
index 26ff5c0..b5b908a 100644
--- a/src/ast.cpp
+++ b/src/ast.cpp
@@ -86,7 +86,10 @@ namespace AST {
         for (auto& param : this->m_params) {
             if (counter++ > 0)
                 out << ", ";
-            out << param.second->formatted() << " " << param.first;
+            out << param.second->formatted();
+            if (param.first) {
+                out << " " << *param.first;
+            }
         }
 
         out << ") -> ";
diff --git a/src/ast.h b/src/ast.h
index 2a46fde..060fa00 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -175,14 +175,14 @@ namespace AST {
     class Function : public TopLevelStatement {
     private:
         std::unique_ptr<types::Type> m_return_ty;
-        std::vector<std::pair<std::string, std::unique_ptr<types::Type>>> m_params;
+        std::vector<std::pair<std::optional<std::string>, std::unique_ptr<types::Type>>> m_params;
         std::string m_name;
         std::optional<std::vector<std::unique_ptr<Statement>>> m_statements;
     public:
         Function(
             token::Metadata meta,
             std::unique_ptr<types::Type> return_ty,
-            std::vector<std::pair<std::string, std::unique_ptr<types::Type>>> params,
+            std::vector<std::pair<std::optional<std::string>, std::unique_ptr<types::Type>>> params,
             std::string name,
             std::optional<std::vector<std::unique_ptr<Statement>>> statements)
             : TopLevelStatement{ meta }
diff --git a/src/codegen.cpp b/src/codegen.cpp
index 4c5917a..15fea41 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -209,11 +209,13 @@ namespace AST {
             for (auto& param : this->m_params) {
                 auto param_ty_ptr = param_ty_ptrs[counter];
                 auto arg = function->getArg(counter++);
-                arg->setName(param.first);
-                inner_scope.values[param.first] = codegen::StackValue{
-                    arg,
-                    param_ty_ptr,
-                };
+                if (param.first) {
+                    arg->setName(*param.first);
+                    inner_scope.values[*param.first] = codegen::StackValue{
+                        arg,
+                        param_ty_ptr,
+                    };
+                }
             }
 
             for (auto& statement : *this->m_statements) {
diff --git a/src/parsing.cpp b/src/parsing.cpp
index 82347ad..0b591dd 100644
--- a/src/parsing.cpp
+++ b/src/parsing.cpp
@@ -274,14 +274,17 @@ namespace parsing {
             auto name_token = inner.expect(token::Type::Ident);
             inner.expect(token::Type::Symbol, "(");
 
-            std::vector<std::pair<std::string, std::unique_ptr<types::Type>>> params;
+            std::vector<std::pair<std::optional<std::string>, std::unique_ptr<types::Type>>> params;
             while (inner.peek().content != ")") {
                 if (params.size() > 0) {
                     inner.expect(token::Type::Symbol, ",");
                 }
                 auto param_ty = parse_type(inner).unwrap();
-                auto param_name = inner.expect(token::Type::Ident);
-                params.push_back(std::pair(param_name.content, std::move(param_ty)));
+                std::optional<std::string> param_name{};
+                if (inner.peek().type == token::Type::Ident) {
+                    param_name = inner.expect(token::Type::Ident).content;
+                }
+                params.push_back(std::pair(param_name, std::move(param_ty)));
             }
 
             inner.expect(token::Type::Symbol, ")");
diff --git a/test.c b/test.c
index c312b01..75c3f0c 100644
--- a/test.c
+++ b/test.c
@@ -1,4 +1,4 @@
-void printf(char* b, int num);
+void printf(char*, int);
 
 int fibonacci(int n) {
     if (n < 2)