diff --git a/tools/test-run-dev b/tools/test-run-dev
index 204ca83a42..9be38c698a 100755
--- a/tools/test-run-dev
+++ b/tools/test-run-dev
@@ -17,13 +17,13 @@ TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
 
 def start_server(logfile_name: str) -> Tuple[bool, str]:
     failure = True
-    key = "Quit the server with CTRL-C."
+    key = "Quit the server with CONTROL-C."
     datalog = []
-    with open(logfile_name, "r", buffering=0) as logfile:
+    with open(logfile_name, "rb", buffering=0) as logfile:
         for i in range(200):
             time.sleep(0.5)
             print(f"{i}. Polling run-dev...")
-            new_data = logfile.read()
+            new_data = logfile.read().decode()
             if new_data:
                 datalog.append(new_data)