diff --git a/src/writesas.cpp b/src/writesas.cpp
index 3737088..7e71e75 100644
--- a/src/writesas.cpp
+++ b/src/writesas.cpp
@@ -644,7 +644,7 @@ void writesas(const char * filePath, Rcpp::DataFrame dat, uint8_t compress,
     post_shlen = sas.tellg();
     potabs[shc].SH_LEN = post_shlen - pre_shlen;
     // on the last subheader
-    potabs[shc].COMPRESSION = 1;
+    potabs[shc].COMPRESSION = 0; // previously was 1
     /************************************************************************/
 
     /**** case 3 ************************************************************/