diff --git a/libs/ast/source/type_check.cpp b/libs/ast/source/type_check.cpp
index e180935..73d1152 100644
--- a/libs/ast/source/type_check.cpp
+++ b/libs/ast/source/type_check.cpp
@@ -542,7 +542,7 @@ namespace pslang::ast
 					std::string function_name;
 
 					if (auto identifier = std::get_if<ast::identifier>(node.function.get()))
-						function_name = identifier->name + " ";
+						function_name = "\"" + identifier->name + "\" ";
 
 					auto function_type = get_type(*node.function);
 
@@ -558,7 +558,7 @@ namespace pslang::ast
 					if (ftype->arguments.size() != node.arguments.size())
 					{
 						std::ostringstream os;
-						os << "Cannot call function " << function_name << " of type ";
+						os << "Cannot call function " << function_name << "of type ";
 						print(os, *function_type);
 						os << ": expected " << ftype->arguments.size() << " arguments, but got " << node.arguments.size();
 						throw type_error(os.str(), node.location);
@@ -570,7 +570,7 @@ namespace pslang::ast
 						if (!types::equal(*arg_type, *ftype->arguments[i]))
 						{
 							std::ostringstream os;
-							os << "Cannot call function " << function_name << " of type ";
+							os << "Cannot call function " << function_name << "of type ";
 							print(os, *function_type);
 							os << ": argument #" << i << " expected to have type ";
 							print(os, *ftype->arguments[i]);