diff --git a/src/draw/sw/lv_draw_sw_transform.c b/src/draw/sw/lv_draw_sw_transform.c
index 14e25f454..d835f58e1 100644
--- a/src/draw/sw/lv_draw_sw_transform.c
+++ b/src/draw/sw/lv_draw_sw_transform.c
@@ -136,8 +136,8 @@ void lv_draw_sw_transform(lv_draw_unit_t * draw_unit, const lv_area_t * dest_are
     bool aa = draw_dsc->antialias;
     bool is_rotated = draw_dsc->rotation;
 
-    int32_t xs_ups, ys_ups, ys_ups_start, ys_step_256_original;
-    int32_t xs_step_256, ys_step_256;
+    int32_t xs_ups = 0, ys_ups = 0, ys_ups_start = 0, ys_step_256_original = 0;
+    int32_t xs_step_256 = 0, ys_step_256 = 0;
 
     /*If scaled only make some simplification to avoid rounding errors.
      *For example if there is a 100x100 image zoomed to 300%