diff --git a/check_logs.py b/check_logs.py
index 7e68a846..d4197bb6 100755
--- a/check_logs.py
+++ b/check_logs.py
@@ -132,6 +132,12 @@ def run_boot(build):
             boot_qemu += ["-t", "20m"]
         else:
             boot_qemu += ["-t", "10m"]
+
+    # Before spawning a process with potentially different IO buffering,
+    # flush the existing buffers so output is ordered correctly.
+    sys.stdout.flush()
+    sys.stderr.flush()
+
     try:
         subprocess.run(boot_qemu, check=True)
     except subprocess.CalledProcessError as e:
diff --git a/utils.py b/utils.py
index 420f6160..c0020391 100644
--- a/utils.py
+++ b/utils.py
@@ -126,10 +126,12 @@ def get_build():
 
 def print_red(msg):
     print("\033[91m%s\033[0m" % msg, file=sys.stderr)
+    sys.stderr.flush()
 
 
 def print_yellow(msg):
-    print("\033[93m%s\033[0m" % msg)
+    print("\033[93m%s\033[0m" % msg, file=sys.stdout)
+    sys.stdout.flush()
 
 
 def patch_series_flag(tree):