diff --git a/module_build_service/builder/KojiModuleBuilder.py b/module_build_service/builder/KojiModuleBuilder.py
index b8044519..5b56f29a 100644
--- a/module_build_service/builder/KojiModuleBuilder.py
+++ b/module_build_service/builder/KojiModuleBuilder.py
@@ -356,7 +356,7 @@ class KojiModuleBuilder(GenericBuilder):
         fd.close()
         log.debug("Building %s.spec" % name)
 
-        # We are not interested in the rpmbuild stdout...
+        # We are not interested in the rpmbuild output...
         null_fd = open(os.devnull, "w")
         execute_cmd(
             [
@@ -369,7 +369,7 @@ class KojiModuleBuilder(GenericBuilder):
                 "_sourcedir %s" % sources_dir,
             ],
             cwd=td,
-            stdout=null_fd,
+            output=null_fd,
         )
         null_fd.close()
         sdir = os.path.join(td, "SRPMS")
diff --git a/module_build_service/builder/MockModuleBuilder.py b/module_build_service/builder/MockModuleBuilder.py
index ccfc5f29..370339c4 100644
--- a/module_build_service/builder/MockModuleBuilder.py
+++ b/module_build_service/builder/MockModuleBuilder.py
@@ -646,11 +646,9 @@ class MockModuleBuilder(GenericBuilder):
         mock_config = os.path.join(
             self.configdir, "mock-%s.cfg" % str(threading.current_thread().name))
 
-        # Open the logs to which we will forward mock stdout/stderr.
-        mock_stdout_log = open(
-            os.path.join(self.resultsdir, artifact_name + "-mock-stdout.log"), "w")
-        mock_stderr_log = open(
-            os.path.join(self.resultsdir, artifact_name + "-mock-stderr.log"), "w")
+        # Open the log to which we will forward mock stdout/stderr.
+        mock_output_log = open(
+            os.path.join(self.resultsdir, artifact_name + "-mock-output.log"), "w")
 
         srpm = artifact_name
         resultsdir = builder.resultsdir
@@ -658,12 +656,11 @@ class MockModuleBuilder(GenericBuilder):
             # Initialize mock.
             execute_cmd(
                 ["mock", "-v", "-r", mock_config, "--init"],
-                stdout=mock_stdout_log,
-                stderr=mock_stderr_log,
+                output=mock_output_log,
             )
 
             # Start the build and store results to resultsdir
-            builder.build(mock_stdout_log, mock_stderr_log)
+            builder.build(mock_output_log)
             srpm = find_srpm(resultsdir)
 
             # Emit messages simulating complete build. These messages
@@ -687,8 +684,7 @@ class MockModuleBuilder(GenericBuilder):
             with open(os.path.join(resultsdir, "status.log"), "w") as f:
                 f.write("failed\n")
 
-        mock_stdout_log.close()
-        mock_stderr_log.close()
+        mock_output_log.close()
 
         self._save_log(resultsdir, "state.log", artifact_name)
         self._save_log(resultsdir, "root.log", artifact_name)
@@ -810,8 +806,8 @@ class BaseBuilder(object):
         self.resultsdir = resultsdir
         self.cmd = ["mock", "-v", "-r", config, "--no-clean", "--resultdir=%s" % resultsdir]
 
-    def build(self, stdout, stderr):
-        execute_cmd(self.cmd, stdout=stdout, stderr=stderr)
+    def build(self, output):
+        execute_cmd(self.cmd, output=output)
 
 
 class SRPMBuilder(BaseBuilder):
diff --git a/module_build_service/builder/utils.py b/module_build_service/builder/utils.py
index 5c779e09..cdffac60 100644
--- a/module_build_service/builder/utils.py
+++ b/module_build_service/builder/utils.py
@@ -26,27 +26,24 @@ def find_srpm(cod):
             return os.path.join(cod, f)
 
 
-def execute_cmd(args, stdout=None, stderr=None, cwd=None):
+def execute_cmd(args, output=None, cwd=None):
     """
-    Executes command defined by `args`. If `stdout` or `stderr` is set to
-    Python file object, the stderr/stdout output is redirecter to that file.
+    Executes command defined by `args`. If `output` is set to
+    Python file object, the stderr and stdout output is redirected to that file.
     If `cwd` is set, current working directory is set accordingly for the
     executed command.
 
     :param args: list defining the command to execute.
-    :param stdout: Python file object to redirect the stdout to.
-    :param stderr: Python file object to redirect the stderr to.
+    :param output: Python file object to redirect the stderr and stdout to.
     :param cwd: string defining the current working directory for command.
     :raises RuntimeError: Raised when command exits with non-zero exit code.
     """
     out_log_msg = ""
-    if stdout and hasattr(stdout, "name"):
-        out_log_msg += ", stdout log: %s" % stdout.name
-    if stderr and hasattr(stderr, "name"):
-        out_log_msg += ", stderr log: %s" % stderr.name
+    if output and hasattr(output, "name"):
+        out_log_msg += ", output log: %s" % output.name
 
     log.info("Executing the command \"%s\"%s" % (" ".join(args), out_log_msg))
-    proc = subprocess.Popen(args, stdout=stdout, stderr=stderr, cwd=cwd)
+    proc = subprocess.Popen(args, stdout=output, stderr=output, cwd=cwd)
     out, err = proc.communicate()
 
     if proc.returncode != 0: