diff --git a/firmware/user/src/ledprog_pep.c b/firmware/user/src/ledprog_pep.c
index 742a241..7f7d3a1 100644
--- a/firmware/user/src/ledprog_pep.c
+++ b/firmware/user/src/ledprog_pep.c
@@ -418,8 +418,7 @@ static void pep_6_random(uint8_t tick)
     rand_flash_timeout--;
 
     if (!rand_timeout) {
-        rand_timeout = prng_scale16(20, 150);
-        rand_timeout <<= 7;
+        rand_timeout = prng_scale16(20*128, 150*128);
 
         rand_program = 6 * prng_get8();
         rand_program >>= 8;
diff --git a/firmware/user/src/rand.c b/firmware/user/src/rand.c
index a8082ba..8034cae 100644
--- a/firmware/user/src/rand.c
+++ b/firmware/user/src/rand.c
@@ -151,7 +151,7 @@ static uint32_t tinymt32_temper (tinymt32_t* s)
 
 uint16_t prng_scale16(uint16_t min, uint16_t max)
 {
-    uint16_t rnd;
+    uint32_t rnd;
 
     rnd = prng_get16();
     rnd *= (max - min);