diff --git a/appveyor.yml b/appveyor.yml
index e0ee99c61410ba8274296100122b9eb046055688..435cd344938176216197b9983f92b9f3416881bc 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -15,6 +15,7 @@ environment:
  CCACHE_URL: http://alam.srb2.org/ccache.exe
  CCACHE_COMPRESS: true
  CCACHE_DIR: C:\Users\appveyor\.ccache
+ CFLAGS: -ggdb
 
 cache:
 - nasm-2.12.01.zip