diff --git a/src/ssb.tests.c b/src/ssb.tests.c
index 246b0bb7..9e4fa1a8 100644
--- a/src/ssb.tests.c
+++ b/src/ssb.tests.c
@@ -902,8 +902,7 @@ static void _write_file(const char* path, const char* contents)
 	FILE* file = fopen(path, "w");
 	if (!file)
 	{
-		printf("Unable to write %s: %s.\n", path, strerror(errno));
-		fflush(stdout);
+		tf_printf("Unable to write %s: %s.\n", path, strerror(errno));
 		abort();
 	}
 	fputs(contents, file);
@@ -933,7 +932,7 @@ void tf_ssb_test_encrypt(const tf_test_options_t* options)
 	int result = system(command);
 	(void)result;
 	assert(WIFEXITED(result));
-	printf("returned %d\n", WEXITSTATUS(result));
+	tf_printf("returned %d\n", WEXITSTATUS(result));
 	assert(WEXITSTATUS(result) == 0);
 }
 
@@ -1028,13 +1027,13 @@ void tf_ssb_test_publish(const tf_test_options_t* options)
 	int result = system(command);
 	(void)result;
 	assert(WIFEXITED(result));
-	printf("returned %d\n", WEXITSTATUS(result));
+	tf_printf("returned %d\n", WEXITSTATUS(result));
 	assert(WEXITSTATUS(result) == 0);
 
 	snprintf(command, sizeof(command), "%s publish -d out/test_db0.sqlite -u :admin -i %s -c '{\"type\": \"post\", \"text\": \"Two.\"}'", executable, id);
 	result = system(command);
 	assert(WIFEXITED(result));
-	printf("returned %d\n", WEXITSTATUS(result));
+	tf_printf("returned %d\n", WEXITSTATUS(result));
 	assert(WEXITSTATUS(result) == 0);
 
 	uv_run(&loop, UV_RUN_DEFAULT);
diff --git a/src/tests.c b/src/tests.c
index 87f622ee..d496ac91 100644
--- a/src/tests.c
+++ b/src/tests.c
@@ -40,8 +40,7 @@ static void _write_file(const char* path, const char* contents)
 	FILE* file = fopen(path, "w");
 	if (!file)
 	{
-		printf("Unable to write %s: %s.\n", path, strerror(errno));
-		fflush(stdout);
+		tf_printf("Unable to write %s: %s.\n", path, strerror(errno));
 		abort();
 	}
 	fputs(contents, file);