diff --git a/tests/zstreamtest.c b/tests/zstreamtest.c
index e087dd72..0785aecb 100644
--- a/tests/zstreamtest.c
+++ b/tests/zstreamtest.c
@@ -1292,6 +1292,7 @@ static int fuzzerTests_newAPI(U32 seed, U32 nbTests, unsigned startTest, double
                 if (FUZ_rand(&lseed) & 1) CHECK_Z( ZSTD_CCtx_setParameter(zc, ZSTD_p_minMatch, cParams.searchLength) );
                 if (FUZ_rand(&lseed) & 1) CHECK_Z( ZSTD_CCtx_setParameter(zc, ZSTD_p_targetLength, cParams.targetLength) );
 
+                if (FUZ_rand(&lseed) & 1) { dict=NULL; dictSize=0; }
                 CHECK_Z( ZSTD_CCtx_loadDictionary(zc, dict, dictSize) );
 
                 /* to do : check that cParams are blocked after loading non-NULL dictionary */