diff --git a/lib/ssd1306.c b/lib/ssd1306.c
index a3b3354..84b9b02 100644
--- a/lib/ssd1306.c
+++ b/lib/ssd1306.c
@@ -519,7 +519,7 @@ uint8_t SSD1306_DrawPixel (uint8_t x, uint8_t y)
   uint8_t pixel = 0;
 
   // if out of range
-  if ((x > MAX_X) && (y > MAX_Y)) {
+  if ((x > MAX_X) || (y > MAX_Y)) {
     // out of range
     return SSD1306_ERROR;
   }