diff --git a/update_filelist.py b/update_filelist.py
index 2e3741b62..967c2a4dc 100644
--- a/update_filelist.py
+++ b/update_filelist.py
@@ -10,12 +10,16 @@ data = ""
 
 with open(filename, 'r') as project:
     data = project.read()
-    sources = subprocess.getoutput("find ./src -type f -regex '.*\.cpp' | sed 's_\./_    _g'")
+    sources_list = subprocess.getoutput("find ./src -type f -regex '.*\.cpp' | sed 's_\./_    _g'").splitlines()
+    sources_list.sort(key=str.lower)
+    sources = "\n".join(sources_list)
     sources = re.sub(r'$', r' \\\\', sources, flags=re.MULTILINE)
     sources += "\n"
     data = re.sub(r'^SOURCES(.|\r|\n)*?^$', 'SOURCES += \\\n' + sources, data, flags=re.MULTILINE)
 
-    headers = subprocess.getoutput("find ./src -type f -regex '.*\.hpp' | sed 's_\./_    _g'")
+    headers_list = subprocess.getoutput("find ./src -type f -regex '.*\.hpp' | sed 's_\./_    _g'").splitlines()
+    headers_list.sort(key=str.lower)
+    headers = "\n".join(headers_list)
     headers = re.sub(r'$', r' \\\\', headers, flags=re.MULTILINE)
     headers += "\n"
     data = re.sub(r'^HEADERS(.|\r|\n)*?^$', 'HEADERS += \\\n' + headers, data, flags=re.MULTILINE)