diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 4de67777f..a8d2b3a47 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -50,7 +50,7 @@ struct ZSTD_CDict_s {
     ZSTD_compressedBlockState_t cBlockState;
     ZSTD_customMem customMem;
     U32 dictID;
-    BYTE compressionLevel; /* 0 indicates that advanced API was used to select CDict params */
+    int compressionLevel; /* 0 indicates that advanced API was used to select CDict params */
 };  /* typedef'd to ZSTD_CDict within "zstd.h" */
 
 ZSTD_CCtx* ZSTD_createCCtx(void)