diff --git a/conda-recipes/main-library/meta.yaml b/conda-recipes/main-library/meta.yaml
index 8b11b4536..d0841d6f4 100755
--- a/conda-recipes/main-library/meta.yaml
+++ b/conda-recipes/main-library/meta.yaml
@@ -28,7 +28,8 @@ requirements:
     - libgl-devel  # [linux]
     - libtiff
     - zlib
-
+    - expat
+  
   run:
     - libstdcxx-ng
     - libgcc-ng 
@@ -57,6 +58,7 @@ outputs:
         - {{ compiler('c') }}
         - {{compiler('cxx')}}
         - {{ pin_subpackage('slsdetlib', exact=True) }}
+        
 
       run:
         - {{ pin_subpackage('slsdetlib', exact=True) }}