diff --git a/tests/zstreamtest.c b/tests/zstreamtest.c
index 3ab8d053..33ed11f9 100644
--- a/tests/zstreamtest.c
+++ b/tests/zstreamtest.c
@@ -1193,7 +1193,7 @@ static int fuzzerTests_newAPI(U32 seed, U32 nbTests, unsigned startTest, double
     size_t dictSize = 0;
     U32 oldTestLog = 0;
     U32 const cLevelMax = bigTests ? (U32)ZSTD_maxCLevel() : g_cLevelMax_smallTests;
-    U32 const nbThreadsMax = bigTests ? 5 : 2;
+    U32 const nbThreadsMax = bigTests ? 5 : 1;
 
     /* allocations */
     cNoiseBuffer[0] = (BYTE*)malloc (srcBufferSize);