diff --git a/core/src/trezor/ui/__init__.py b/core/src/trezor/ui/__init__.py
index e56ed71438..cffd0859b0 100644
--- a/core/src/trezor/ui/__init__.py
+++ b/core/src/trezor/ui/__init__.py
@@ -70,9 +70,9 @@ from trezor.ui import style  # isort:skip
 from trezor.ui.style import *  # isort:skip # noqa: F401,F403
 
 
-def pulse(coef: int) -> float:
+def pulse(period: int, offset: int = 0) -> float:
     # normalize sin from interval -1:1 to 0:1
-    return 0.5 + 0.5 * math.sin(utime.ticks_us() / coef)
+    return 0.5 + 0.5 * math.sin(2 * math.pi * (utime.ticks_us() + offset) / period)
 
 
 async def click() -> Pos:
diff --git a/core/src/trezor/ui/scroll.py b/core/src/trezor/ui/scroll.py
index 9015ae92d9..dd15f62871 100644
--- a/core/src/trezor/ui/scroll.py
+++ b/core/src/trezor/ui/scroll.py
@@ -32,10 +32,10 @@ def render_scrollbar(pages: int, page: int) -> None:
 
 
 def render_swipe_icon() -> None:
-    DRAW_DELAY = const(200000)
+    PULSE_PERIOD = const(1200000)
 
     icon = res.load(ui.ICON_SWIPE)
-    t = ui.pulse(DRAW_DELAY)
+    t = ui.pulse(PULSE_PERIOD)
     c = ui.blend(ui.GREY, ui.DARK_GREY, t)
     ui.display.icon(70, 205, icon, c, ui.BG)