diff --git a/programs/fileio.c b/programs/fileio.c
index d0804a361..01126c113 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -2535,10 +2535,12 @@ static int FIO_rust_zstd_compressStream(
         (FIO_rust_zstd_projection_context_t*)opaque;
     ZSTD_inBuffer inBuff;
     ZSTD_outBuffer outBuff;
+    size_t toFlush;
+    size_t result;
     FIO_setInBuffer(&inBuff, input, inputSize, inputPos);
     FIO_setOutBuffer(&outBuff, output, outputSize, 0);
-    size_t const toFlush = ZSTD_toFlushNow(context->cctx);
-    size_t const result = ZSTD_compressStream2(
+    toFlush = ZSTD_toFlushNow(context->cctx);
+    result = ZSTD_compressStream2(
         context->cctx, &outBuff, &inBuff, (ZSTD_EndDirective)directive);
 
     *inputPosAfter = inBuff.pos;