diff --git a/lib/compress/zstdmt_compress.h b/lib/compress/zstdmt_compress.h
index 3b4c14f0e..3d9614a7e 100644
--- a/lib/compress/zstdmt_compress.h
+++ b/lib/compress/zstdmt_compress.h
@@ -32,11 +32,11 @@
 
 
 /* ===   Constants   === */
-#ifndef ZSTDMT_NBWORKERS_MAX
+#ifndef ZSTDMT_NBWORKERS_MAX   /* can be modified at compile time */
 #  define ZSTDMT_NBWORKERS_MAX 200
 #endif
-#ifndef ZSTDMT_JOBSIZE_MIN
-#  define ZSTDMT_JOBSIZE_MIN (1 MB)
+#ifndef ZSTDMT_JOBSIZE_MIN   /* can be modified at compile time */
+#  define ZSTDMT_JOBSIZE_MIN (512 KB)
 #endif
 #define ZSTDMT_JOBLOG_MAX   (MEM_32bits() ? 29 : 30)
 #define ZSTDMT_JOBSIZE_MAX  (MEM_32bits() ? (512 MB) : (1024 MB))
diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 1b1042393..2c6c60d38 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -1589,6 +1589,7 @@ static int basicUnitTests(U32 const seed, double compressibility)
 
     DISPLAYLEVEL(3, "test%3i : setting multithreaded parameters : ", testNb++)
     {   ZSTD_CCtx_params* params = ZSTD_createCCtxParams();
+        int const jobSize = 512 KB;
         int value;
         /* Check that the overlap log and job size are unset. */
         CHECK( ZSTD_CCtxParams_getParameter(params, ZSTD_c_overlapLog, &value) );
@@ -1597,19 +1598,18 @@ static int basicUnitTests(U32 const seed, double compressibility)
         CHECK_EQ(value, 0);
         /* Set and check the overlap log and job size. */
         CHECK( ZSTD_CCtxParams_setParameter(params, ZSTD_c_overlapLog, 5) );
-        CHECK( ZSTD_CCtxParams_setParameter(params, ZSTD_c_jobSize, 2 MB) );
+        CHECK( ZSTD_CCtxParams_setParameter(params, ZSTD_c_jobSize, jobSize) );
         CHECK( ZSTD_CCtxParams_getParameter(params, ZSTD_c_overlapLog, &value) );
         CHECK_EQ(value, 5);
         CHECK( ZSTD_CCtxParams_getParameter(params, ZSTD_c_jobSize, &value) );
-        CHECK_EQ(value, 2 MB);
+        CHECK_EQ(value, jobSize);
         /* Set the number of workers and check the overlap log and job size. */
         CHECK( ZSTD_CCtxParams_setParameter(params, ZSTD_c_nbWorkers, 2) );
         CHECK( ZSTD_CCtxParams_getParameter(params, ZSTD_c_overlapLog, &value) );
         CHECK_EQ(value, 5);
         CHECK( ZSTD_CCtxParams_getParameter(params, ZSTD_c_jobSize, &value) );
-        CHECK_EQ(value, 2 MB);
+        CHECK_EQ(value, jobSize);
         ZSTD_freeCCtxParams(params);
-
     }
     DISPLAYLEVEL(3, "OK \n");