diff --git a/core/embed/extmod/modtrezorui/display.c b/core/embed/extmod/modtrezorui/display.c
index db2c69cdc..a377b0de3 100644
--- a/core/embed/extmod/modtrezorui/display.c
+++ b/core/embed/extmod/modtrezorui/display.c
@@ -872,8 +872,7 @@ int display_text_height(int font) {
 
 #define QR_MAX_VERSION 9
 
-void display_qrcode(int x, int y, const char *data, uint32_t datalen,
-                    uint8_t scale) {
+void display_qrcode(int x, int y, const char *data, uint8_t scale) {
   if (scale < 1 || scale > 10) return;
 
   uint8_t codedata[qrcodegen_BUFFER_LEN_FOR_VERSION(QR_MAX_VERSION)] = {0};
diff --git a/core/embed/extmod/modtrezorui/display.h b/core/embed/extmod/modtrezorui/display.h
index 797cc6a85..dcad222e3 100644
--- a/core/embed/extmod/modtrezorui/display.h
+++ b/core/embed/extmod/modtrezorui/display.h
@@ -128,8 +128,7 @@ int display_text_split(const char *text, int textlen, int font,
                        int requested_width);
 int display_text_height(int font);
 
-void display_qrcode(int x, int y, const char *data, uint32_t datalen,
-                    uint8_t scale);
+void display_qrcode(int x, int y, const char *data, uint8_t scale);
 
 void display_offset(int set_xy[2], int *get_x, int *get_y);
 int display_orientation(int degrees);
diff --git a/core/embed/extmod/modtrezorui/modtrezorui-display.h b/core/embed/extmod/modtrezorui/modtrezorui-display.h
index 966c9efc7..0fb03c65e 100644
--- a/core/embed/extmod/modtrezorui/modtrezorui-display.h
+++ b/core/embed/extmod/modtrezorui/modtrezorui-display.h
@@ -476,7 +476,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorui_Display_text_split_obj,
                                            4, 4,
                                            mod_trezorui_Display_text_split);
 
-/// def qrcode(self, x: int, y: int, data: bytes, scale: int) -> None:
+/// def qrcode(self, x: int, y: int, data: str, scale: int) -> None:
 ///     """
 ///     Renders data encoded as a QR code centered at position (x,y).
 ///     Scale determines a zoom factor.
@@ -489,10 +489,9 @@ STATIC mp_obj_t mod_trezorui_Display_qrcode(size_t n_args,
   if (scale < 1 || scale > 10) {
     mp_raise_ValueError("Scale has to be between 1 and 10");
   }
-  mp_buffer_info_t data = {0};
-  mp_get_buffer_raise(args[3], &data, MP_BUFFER_READ);
-  if (data.len > 0) {
-    display_qrcode(x, y, data.buf, data.len, scale);
+  const char *data = mp_obj_str_get_str(args[3]);
+  if (data) {
+    display_qrcode(x, y, data, scale);
   }
   return mp_const_none;
 }
diff --git a/core/embed/prodtest/main.c b/core/embed/prodtest/main.c
index d7350864e..b4e523426 100644
--- a/core/embed/prodtest/main.c
+++ b/core/embed/prodtest/main.c
@@ -385,7 +385,7 @@ int main(void) {
   // format: TREZOR2-YYMMDD
   if (sectrue == flash_otp_read(FLASH_OTP_BLOCK_BATCH, 0, (uint8_t *)dom, 32) &&
       0 == memcmp(dom, "TREZOR2-", 8) && dom[31] == 0) {
-    display_qrcode(DISPLAY_RESX / 2, DISPLAY_RESY / 2, dom, strlen(dom), 4);
+    display_qrcode(DISPLAY_RESX / 2, DISPLAY_RESY / 2, dom, 4);
     display_text_center(DISPLAY_RESX / 2, DISPLAY_RESY - 30, dom + 8, -1,
                         FONT_BOLD, COLOR_WHITE, COLOR_BLACK);
   }
diff --git a/core/mocks/generated/trezorui.pyi b/core/mocks/generated/trezorui.pyi
index 98c1a069e..2c992d779 100644
--- a/core/mocks/generated/trezorui.pyi
+++ b/core/mocks/generated/trezorui.pyi
@@ -175,7 +175,7 @@ class Display:
         font is used for rendering.
         """
 
-    def qrcode(self, x: int, y: int, data: bytes, scale: int) -> None:
+    def qrcode(self, x: int, y: int, data: str, scale: int) -> None:
         """
         Renders data encoded as a QR code centered at position (x,y).
         Scale determines a zoom factor.
diff --git a/core/src/trezor/ui/qr.py b/core/src/trezor/ui/qr.py
index e81e6f91b..6761795a1 100644
--- a/core/src/trezor/ui/qr.py
+++ b/core/src/trezor/ui/qr.py
@@ -40,5 +40,5 @@ class Qr(ui.Component):
 
     def on_render(self) -> None:
         if self.repaint:
-            ui.display.qrcode(self.x, self.y, self.data.encode(), self.scale)
+            ui.display.qrcode(self.x, self.y, self.data, self.scale)
             self.repaint = False