diff --git a/tests/zstreamtest.c b/tests/zstreamtest.c
index bef8734c7..c053172e9 100644
--- a/tests/zstreamtest.c
+++ b/tests/zstreamtest.c
@@ -834,9 +834,10 @@ static int fuzzerTests_MT(U32 seed, U32 nbTests, unsigned startTest, double comp
                 DISPLAYLEVEL(5, "Init with windowLog = %u \n", params.cParams.windowLog);
                 params.fParams.checksumFlag = FUZ_rand(&lseed) & 1;
                 params.fParams.noDictIDFlag = FUZ_rand(&lseed) & 1;
-                {   size_t const initError = ZSTDMT_initCStream_advanced(zc, dict, dictSize, params, pledgedSrcSize);
-                    CHECK (ZSTD_isError(initError),"ZSTDMT_initCStream_advanced error : %s", ZSTD_getErrorName(initError));
-        }   }   }
+                { size_t const initError = ZSTDMT_initCStream_advanced(zc, dict, dictSize, params, pledgedSrcSize);
+                  CHECK (ZSTD_isError(initError),"ZSTDMT_initCStream_advanced error : %s", ZSTD_getErrorName(initError)); }
+                ZSTDMT_setMTCtxParameter(zc, ZSTDMT_p_overlapSectionLog, FUZ_rand(&lseed) % 12);
+        }   }
 
         /* multi-segments compression test */
         XXH64_reset(&xxhState, 0);