diff --git a/examples/example_response_server.php b/examples/example_response_server.php
index 76b05a3..bd8031f 100644
--- a/examples/example_response_server.php
+++ b/examples/example_response_server.php
@@ -27,7 +27,7 @@
 $logger = new EchoLogger();
 
 $loop = React\EventLoop\Loop::get();
-$socket = new SocketServer("${address}:{$port}", [], $loop);
+$socket = new SocketServer("{$address}:{$port}", [], $loop);
 
 $socket->on('connection', function (React\Socket\ConnectionInterface $conn) use ($logger) {
     $logger->debug($conn->getRemoteAddress() . ": connected: ");
diff --git a/examples/rtu_usb_to_serial.php b/examples/rtu_usb_to_serial.php
index cd74584..7f662a0 100644
--- a/examples/rtu_usb_to_serial.php
+++ b/examples/rtu_usb_to_serial.php
@@ -47,7 +47,7 @@
         '-ixon', // disable XON/XOFF flow control
         '-crtscts', // disable RTS/CTS handshaking
     ]);
-    $sttyResult = exec("stty -F ${device} ${sttyModes}");
+    $sttyResult = exec("stty -F {$device} {$sttyModes}");
     if ($sttyResult === false) {
         echo 'stty command failed' . PHP_EOL;
         exit(1);
diff --git a/src/Composer/AddressSplitter.php b/src/Composer/AddressSplitter.php
index 72d5e6c..d83981f 100644
--- a/src/Composer/AddressSplitter.php
+++ b/src/Composer/AddressSplitter.php
@@ -159,7 +159,7 @@ protected function shouldSplit(Address $currentAddress, int $currentQuantity, Ad
             if ($range->overlaps($from, $to)) {
                 // when currentAddress directly overlaps unaddressable range we have to error out as there is no way to request from that range
                 $size = $currentAddress->getSize();
-                throw new InvalidArgumentException("address at ${from} with size ${size} overlaps unaddressable range");
+                throw new InvalidArgumentException("address at {$from} with size {$size} overlaps unaddressable range");
             }
             if ($previousEnd != -1 && $range->overlaps($previousEnd, $from - 1)) {
                 return true;