diff --git a/PackageInfo.g b/PackageInfo.g
index 99c5926..f46c866 100644
--- a/PackageInfo.g
+++ b/PackageInfo.g
@@ -290,7 +290,7 @@ Dependencies := rec(
   # without these, the package will not load
   # NeededOtherPackages := [["GAPDoc", ">= 0.99"]],
   NeededOtherPackages := [["GBNP", ">=0.9.5"],
-                          ["CAP", ">=0"]],
+                          ["CAP", ">=2015.05.08"]],
   # without these the package will issue a warning while loading
   # SuggestedOtherPackages := [],
   SuggestedOtherPackages := [],
diff --git a/lib/modulecategory.gi b/lib/modulecategory.gi
index 2a1b507..d61685e 100644
--- a/lib/modulecategory.gi
+++ b/lib/modulecategory.gi
@@ -70,6 +70,9 @@ function( A )
   function( summands, i, sum )
     return DirectSumProjections( sum )[ i ];
   end );
-                 
+  
+  SetIsAbelianCategory( category, true );
+  Finalize( category );
+
   return category;
 end );