diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index ea87b4061..7beab6017 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -4439,15 +4439,12 @@ size_t ZSTD_estimateCStreamSize(int compressionLevel)
  * tells how much data has been consumed (input) and produced (output) for current frame.
  * able to count progression inside worker threads (non-blocking mode).
  */
-static ZSTD_frameProgression ZSTD_rust_frameProgression_MT(void* context)
-{
 #ifdef ZSTD_MULTITHREAD
+#  static ZSTD_frameProgression ZSTD_rust_frameProgression_MT(void* context)
+{
     return ZSTDMT_getFrameProgression((ZSTDMT_CCtx*)context);
-#else
-    (void)context;
-    return (ZSTD_frameProgression){ 0 };
-#endif
 }
+#endif
 
 ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx)
 {