diff --git a/src/Data/Number.php b/src/Data/Number.php
index e06c90a03..34865ef14 100644
--- a/src/Data/Number.php
+++ b/src/Data/Number.php
@@ -143,7 +143,7 @@ final class Number extends QRDataModeAbstract{
 			}
 
 			$result .= $toNumericChar((int)($threeDigitsBits / 100));
-			$result .= $toNumericChar(($threeDigitsBits / 10) % 10);
+			$result .= $toNumericChar((int)($threeDigitsBits / 10) % 10);
 			$result .= $toNumericChar($threeDigitsBits % 10);
 
 			$length -= 3;
diff --git a/src/Decoder/Binarizer.php b/src/Decoder/Binarizer.php
index 94387d88e..0ad69de64 100644
--- a/src/Decoder/Binarizer.php
+++ b/src/Decoder/Binarizer.php
@@ -252,7 +252,7 @@ final class Binarizer{
 						// finish the rest of the rows quickly
 						for($yy++, $offset += $width; $yy < self::BLOCK_SIZE; $yy++, $offset += $width){
 							for($xx = 0; $xx < self::BLOCK_SIZE; $xx++){
-								$sum += $luminances[$offset + $xx] & 0xff;
+								$sum += $luminances[(int)($offset + $xx)] & 0xff;
 							}
 						}
 					}