diff --git a/esphome/components/lvgl/widgets/canvas.py b/esphome/components/lvgl/widgets/canvas.py
index 217e8935f1..f0a9cd35ba 100644
--- a/esphome/components/lvgl/widgets/canvas.py
+++ b/esphome/components/lvgl/widgets/canvas.py
@@ -33,7 +33,7 @@ from ..lv_validation import (
     pixels,
     size,
 )
-from ..lvcode import LocalVariable, lv, lv_assign
+from ..lvcode import LocalVariable, lv, lv_assign, lv_expr
 from ..schemas import STYLE_PROPS, STYLE_REMAP, TEXT_SCHEMA, point_schema
 from ..types import LvType, ObjUpdateAction, WidgetType
 from . import Widget, get_widgets
@@ -70,15 +70,18 @@ class CanvasType(WidgetType):
         width = config[CONF_WIDTH]
         height = config[CONF_HEIGHT]
         use_alpha = "_ALPHA" if config[CONF_TRANSPARENT] else ""
-        lv.canvas_set_buffer(
-            w.obj,
-            lv.custom_mem_alloc(
-                literal(f"LV_CANVAS_BUF_SIZE_TRUE_COLOR{use_alpha}({width}, {height})")
-            ),
-            width,
-            height,
-            literal(f"LV_IMG_CF_TRUE_COLOR{use_alpha}"),
+        buf_size = literal(
+            f"LV_CANVAS_BUF_SIZE_TRUE_COLOR{use_alpha}({width}, {height})"
         )
+        with LocalVariable("buf", cg.void, lv_expr.custom_mem_alloc(buf_size)) as buf:
+            cg.add(cg.RawExpression(f"memset({buf}, 0, {buf_size});"))
+            lv.canvas_set_buffer(
+                w.obj,
+                buf,
+                width,
+                height,
+                literal(f"LV_IMG_CF_TRUE_COLOR{use_alpha}"),
+            )
 
 
 canvas_spec = CanvasType()