diff --git a/test/cases.c++ b/test/cases.c++
index fdb99485..06a371a6 100644
--- a/test/cases.c++
+++ b/test/cases.c++
@@ -72,6 +72,7 @@ void configure_actor(unsigned &last_space_id, const actor_testcase testcase, con
   log_trace("configure_actor: space %lu for %s", space_id, testcase2str(testcase));
   global::actors.emplace_back(actor_config(testcase, params, unsigned(space_id), wait4id));
   global::databases.insert(params.pathname_db);
+  params.prng_seed += bleach64(space_id);
 }
 
 void testcase_setup(const char *casename, const actor_params &params, unsigned &last_space_id) {
diff --git a/test/test.c++ b/test/test.c++
index 1d8db898..c13466e5 100644
--- a/test/test.c++
+++ b/test/test.c++
@@ -770,7 +770,7 @@ static bool execute_thunk(const actor_config *const_config, const mdbx_pid_t pid
     size_t iter = 0;
     do {
       if (iter) {
-        prng_seed(config.params.prng_seed += INT32_C(0xA4F4D37B));
+        prng_salt(iter);
         log_verbose("turn PRNG to %u", config.params.prng_seed);
       }
       iter++;
diff --git a/test/test.h++ b/test/test.h++
index 861429ff..876b83cc 100644
--- a/test/test.h++
+++ b/test/test.h++
@@ -263,8 +263,8 @@ public:
   }
 
   static bool review_params(actor_params &params, unsigned space_id) {
+    (void)space_id;
     // silently fix key/data length for fixed-length modes
-    params.prng_seed += bleach32(space_id);
     if ((params.table_flags & MDBX_INTEGERKEY) && params.keylen_min != params.keylen_max)
       params.keylen_min = params.keylen_max;
     if ((params.table_flags & (MDBX_INTEGERDUP | MDBX_DUPFIXED)) && params.datalen_min != params.datalen_max)
diff --git a/test/utils.c++ b/test/utils.c++
index 442e4a21..884fd844 100644
--- a/test/utils.c++
+++ b/test/utils.c++
@@ -124,7 +124,8 @@ void prng_fill(uint64_t &state, void *ptr, size_t bytes) {
 
 /* __thread */ uint64_t prng_state;
 
-void prng_seed(uint64_t seed) { prng_state = bleach64(seed); }
+void prng_seed(uint64_t seed) { prng_state = seed; }
+void prng_salt(unsigned salt) { prng_state += bleach32(salt) * UINT64_C(0xD14A2783862DAB); }
 
 uint32_t prng32(void) { return prng32_white(prng_state); }
 
diff --git a/test/utils.h++ b/test/utils.h++
index caa34049..2abc393b 100644
--- a/test/utils.h++
+++ b/test/utils.h++
@@ -313,6 +313,7 @@ void prng_fill(uint64_t &state, void *ptr, size_t bytes);
 
 extern uint64_t prng_state;
 void prng_seed(uint64_t seed);
+void prng_salt(unsigned salt);
 uint32_t prng32(void);
 uint64_t prng64(void);
 void prng_fill(void *ptr, size_t bytes);