diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index a7fc08c52b..5ceee4166f 100644
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -723,8 +723,8 @@ static void sm501_2d_operation(SM501State *s)
         dst_y -= height - 1;
     }
 
-    if (dst_base >= get_local_mem_size(s) || dst_base +
-        (dst_x + width + (dst_y + height) * (dst_pitch + width)) *
+    if (dst_base >= get_local_mem_size(s) ||
+        dst_base + (dst_x + width + (dst_y + height) * dst_pitch) *
         (1 << format) >= get_local_mem_size(s)) {
         qemu_log_mask(LOG_GUEST_ERROR, "sm501: 2D op dest is outside vram.\n");
         return;
@@ -749,8 +749,8 @@ static void sm501_2d_operation(SM501State *s)
             src_y -= height - 1;
         }
 
-        if (src_base >= get_local_mem_size(s) || src_base +
-            (src_x + width + (src_y + height) * (src_pitch + width)) *
+        if (src_base >= get_local_mem_size(s) ||
+            src_base + (src_x + width + (src_y + height) * src_pitch) *
             (1 << format) >= get_local_mem_size(s)) {
             qemu_log_mask(LOG_GUEST_ERROR,
                           "sm501: 2D op src is outside vram.\n");