diff --git a/cores/portduino/linux/LinuxSerial.cpp b/cores/portduino/linux/LinuxSerial.cpp
index cb18cd7..6bec23d 100644
--- a/cores/portduino/linux/LinuxSerial.cpp
+++ b/cores/portduino/linux/LinuxSerial.cpp
@@ -186,13 +186,26 @@ namespace arduino {
     }
 
     int LinuxSerial::peek(void) {
+        if (hasPeeked) return peekedByte;
+        unsigned char c = 0;
+        ssize_t rv = ::read(serial_port, &c, 1);
+        if (rv == 1) {
+            hasPeeked = true;
+            peekedByte = (int)c;
+            return peekedByte;
+        }
         return -1;
     }
 
     int LinuxSerial::read(void) {
-        int buf = 0;
-        ::read(serial_port, &buf, 1);
-        return buf;
+        if (hasPeeked) {
+            hasPeeked = false;
+            return peekedByte;
+        }
+        unsigned char c = 0;
+        ssize_t rv = ::read(serial_port, &c, 1);
+        if (rv == 1) return (int)c;
+        return -1;
     }
 
     void LinuxSerial::flush(void) {
diff --git a/cores/portduino/linux/LinuxSerial.h b/cores/portduino/linux/LinuxSerial.h
index 95249b6..fd3185a 100644
--- a/cores/portduino/linux/LinuxSerial.h
+++ b/cores/portduino/linux/LinuxSerial.h
@@ -24,6 +24,10 @@ namespace arduino {
         virtual size_t write(uint8_t);
         using Print::write; // pull in write(str) and write(buf, size) from Print
         virtual operator bool();
+
+    private:
+        bool hasPeeked = false;
+        int peekedByte = 0;
     };
 
         class SimSerial : public HardwareSerial {