diff --git a/src/ssn/extractFileStream.ts b/src/ssn/extractFileStream.ts
index 2adf192..c15f804 100644
--- a/src/ssn/extractFileStream.ts
+++ b/src/ssn/extractFileStream.ts
@@ -21,7 +21,7 @@ export default function extractFileStream(file: ISsnFileEntry, inputStream: stre
     curStream = curStream.pipe(decryptTransform);
   }
 
-  if (skipDecompression) {
+  if (!skipDecompression) {
     //pipe into decompression
     const decompressTransform = zlib.createInflateRaw();
     decompressTransform.on('error', (error) => {