diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2379b9985..6d30a63ee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -100,6 +100,9 @@ set(RESOURCE_FILES "sharedconfig.ini" "authconfig.ini" "chatconfig.ini" "worldco
 message(STATUS "Checking resource file integrity")
 
 include(Utils)
+UpdateConfigOption(${PROJECT_BINARY_DIR}/authconfig.ini "port" "auth_server_port")
+UpdateConfigOption(${PROJECT_BINARY_DIR}/chatconfig.ini "port" "chat_server_port")
+UpdateConfigOption(${PROJECT_BINARY_DIR}/masterconfig.ini "port" "master_server_port")
 
 foreach(resource_file ${RESOURCE_FILES})
 	set(file_size 0)
@@ -115,9 +118,6 @@ foreach(resource_file ${RESOURCE_FILES})
 		)
 		message(STATUS "Moved " ${resource_file} " to project binary directory")
 	elseif(resource_file MATCHES ".ini")
-		UpdateConfigOption("build/authconfig.ini" "port" "auth_server_port")
-		UpdateConfigOption("build/chatconfig.ini" "port" "chat_server_port")
-		UpdateConfigOption("build/masterconfig.ini" "port" "master_server_port")
 		message(STATUS "Checking " ${resource_file} " for missing config options")
 		file(READ ${PROJECT_BINARY_DIR}/${resource_file} current_file_contents)
 		string(REPLACE "\\\n" "" current_file_contents ${current_file_contents})
diff --git a/cmake/Utils.cmake b/cmake/Utils.cmake
index c0c67ef07..3c58241d7 100644
--- a/cmake/Utils.cmake
+++ b/cmake/Utils.cmake
@@ -7,6 +7,10 @@ function(UpdateConfigOption file_name old_option_name new_option_name)
 	string(APPEND old_option_name "=")
 	string(APPEND new_option_name "=")
 	message(STATUS "Checking " ${file_name} " for " ${old_option_name} " and adding " ${new_option_name} " if it does not exist")
+	if(NOT EXISTS ${file_name}) 
+		message(STATUS ${file_name} " does not exist. Doing nothing")
+		return()
+	endif()
 	file(READ ${file_name} current_file_contents)
 	string(REPLACE "\\\n" "" current_file_contents ${current_file_contents})
 	string(REPLACE "\n" ";" current_file_contents ${current_file_contents})