diff --git a/src/decompression.jl b/src/decompression.jl
index a3dd471a..a48c7e34 100644
--- a/src/decompression.jl
+++ b/src/decompression.jl
@@ -106,7 +106,7 @@ function compress(
     return Br, Bc
 end
 
-struct UnsupportedDecompressionError
+struct UnsupportedDecompressionError <: Exception
     msg::String
 end