diff --git a/src/finn/builder/build_dataflow.py b/src/finn/builder/build_dataflow.py
index fe12acf46..fd1d53b18 100644
--- a/src/finn/builder/build_dataflow.py
+++ b/src/finn/builder/build_dataflow.py
@@ -59,8 +59,8 @@ def __init__(self, logger, level, originalstream):
     def write(self, buf):
         for line in buf.rstrip().splitlines():
             self.logger.log(self.level, line.rstrip())
-        timestamp = datetime.datetime.fromtimestamp(time.time()).strftime("%Y-%m-%d %H:%M:%S")
-        self.console.write(f"[{timestamp}] " + buf)
+            timestamp = datetime.datetime.fromtimestamp(time.time()).strftime("%Y-%m-%d %H:%M:%S")
+            self.console.write(f"[{timestamp}] " + line.rstrip())
 
     def flush(self):
         self.console.flush()
diff --git a/src/finn/util/basic.py b/src/finn/util/basic.py
index 587fd0611..5c3a271f6 100644
--- a/src/finn/util/basic.py
+++ b/src/finn/util/basic.py
@@ -26,9 +26,9 @@
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+import logging
 import os
 import subprocess
-import sys
 import tempfile
 from qonnx.util.basic import roundup_to_integer_multiple
 
@@ -197,6 +197,9 @@ def build(self, code_gen_dir):
         process_compile.communicate()
 
 
+log = logging.getLogger("launch_process_helper")
+
+
 def launch_process_helper(args, proc_env=None, cwd=None, print_stdout=True):
     """Helper function to launch a process in a way that facilitates logging
     stdout/stderr with Python loggers.
@@ -209,10 +212,10 @@ def launch_process_helper(args, proc_env=None, cwd=None, print_stdout=True):
         (cmd_out, cmd_err) = proc.communicate()
     if cmd_out is not None and print_stdout is True:
         cmd_out = cmd_out.decode("utf-8")
-        sys.stdout.write(cmd_out)
+        log.info(cmd_out)
     if cmd_err is not None:
         cmd_err = cmd_err.decode("utf-8")
-        sys.stderr.write(cmd_err)
+        log.critical(cmd_err)
     return (cmd_out, cmd_err)