diff --git a/mini.cpp b/mini.cpp
index 00c6fa9..7b7e8ad 100644
--- a/mini.cpp
+++ b/mini.cpp
@@ -677,8 +677,8 @@ void vline(int x, int y0, int y1, uint8_t color) {
 }
 
 void rect(int x, int y, int w, int h) {
-    int x1 = w-x+1;
-    int y1 = h-y+1;
+    int x1 = w+x-1;
+    int y1 = h+y-1;
     hline(x, y, x1);
     hline(x, y1, x1);
     vline(x, y, y1);
@@ -691,8 +691,8 @@ void rect(int x, int y, int w, int h, uint8_t color) {
 }
 
 void rectfill(int x, int y, int w, int h) {
-    int x1 = w-x+1;
-    int y1 = h-y+1;
+    int x1 = w+x-1;
+    int y1 = h+y-1;
     for (int i=y; i<=y1; ++i) hline(x, i, x1);
 }