diff --git a/lib/common/fse.h b/lib/common/fse.h
index 1c44f8375..afd780196 100644
--- a/lib/common/fse.h
+++ b/lib/common/fse.h
@@ -184,7 +184,7 @@ FSE_PUBLIC_API size_t FSE_writeNCount (void* buffer, size_t bufferSize, const sh
 /*! Constructor and Destructor of FSE_CTable.
     Note that FSE_CTable size depends on 'tableLog' and 'maxSymbolValue' */
 typedef unsigned FSE_CTable;   /* don't allocate that. It's only meant to be more restrictive than void* */
-FSE_PUBLIC_API FSE_CTable* FSE_createCTable (unsigned tableLog, unsigned maxSymbolValue);
+FSE_PUBLIC_API FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog);
 FSE_PUBLIC_API void        FSE_freeCTable (FSE_CTable* ct);
 
 /*! FSE_buildCTable():
diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index d234903b5..892912f2e 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -649,8 +649,8 @@ ZSTD_compressionParameters ZSTD_adjustCParams_internal(ZSTD_compressionParameter
 
     if (dictSize && (srcSize+1<2) /* srcSize unknown */ )
         srcSize = minSrcSize;  /* presumed small when there is a dictionary */
-    else
-        srcSize -= 1;  /* unknown 0 => -1ULL : presumed large */
+    else if (srcSize == 0)
+        srcSize = ZSTD_CONTENTSIZE_UNKNOWN;  /* 0 == unknown : presumed large */
 
     /* resize windowLog if input is small enough, to use less memory */
     if ( (srcSize < maxWindowResize)