diff --git a/BitcodeEmitter.cpp b/BitcodeEmitter.cpp
index e43fa83..45b6832 100644
--- a/BitcodeEmitter.cpp
+++ b/BitcodeEmitter.cpp
@@ -438,9 +438,7 @@ bool BitcodeEmitter::emit(Branch const& node) {
     return true;
 }
 
-bool BitcodeEmitter::emit(Function const& node) {
-    d->scope.enter();
-
+bool BitcodeEmitter::emitFunctionPrototype(Function const& node, llvm::Function **proto) {
     std::vector<llvm::Type*> argTypes;
 
     for (FunArg const* arg: node.getArgs()) {
@@ -492,6 +490,17 @@ bool BitcodeEmitter::emit(Function const& node) {
         ++argToEmit;
     }
 
+    *proto = func;
+
+    return true;
+}
+
+bool BitcodeEmitter::emit(Function const& node) {
+    llvm::Function *func = nullptr;
+    GUARDED(emitFunctionPrototype(node, &func));
+
+    d->scope.enter();
+
     llvm::BasicBlock *bb = llvm::BasicBlock::Create(
         getGlobalContext(), "entry", func
     );
diff --git a/BitcodeEmitter.hpp b/BitcodeEmitter.hpp
index b8b427f..49823cb 100644
--- a/BitcodeEmitter.hpp
+++ b/BitcodeEmitter.hpp
@@ -26,6 +26,7 @@
 
 namespace llvm {
     class Module;
+    class Function;
 }
 
 namespace monicelli {
@@ -65,6 +66,7 @@ public:
 
 private:
     bool emitSemiExpression(Id const& left, SemiExpression const& right);
+    bool emitFunctionPrototype(Function const& node, llvm::Function **proto);
 
     std::unique_ptr<llvm::Module> module;
     Private *d;