diff --git a/tests/zstreamtest.c b/tests/zstreamtest.c
index c053172e..aeaf02b3 100644
--- a/tests/zstreamtest.c
+++ b/tests/zstreamtest.c
@@ -837,6 +837,7 @@ static int fuzzerTests_MT(U32 seed, U32 nbTests, unsigned startTest, double comp
                 { 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);
+                ZSTDMT_setMTCtxParameter(zc, ZSTDMT_p_sectionSize, FUZ_rand(&lseed) % (2*maxTestSize+1));
         }   }
 
         /* multi-segments compression test */