diff --git a/lib/compress/zstd_cwksp.h b/lib/compress/zstd_cwksp.h
index cc7fb1c715c..cfe808f1505 100644
--- a/lib/compress/zstd_cwksp.h
+++ b/lib/compress/zstd_cwksp.h
@@ -192,6 +192,7 @@ MEM_STATIC void ZSTD_cwksp_assert_internal_consistency(ZSTD_cwksp* ws) {
     {
         intptr_t const offset = __msan_test_shadow(ws->initOnceStart,
             (U8*)ZSTD_cwksp_initialAllocStart(ws) - (U8*)ws->initOnceStart);
+        (void)offset;
 #if defined(ZSTD_MSAN_PRINT)
         if(offset!=-1) {
             __msan_print_shadow((U8*)ws->initOnceStart + offset - 8, 32);