diff --git a/tests/test_uploads.py b/tests/test_uploads.py
index 5695d0c8c2..2040efd051 100644
--- a/tests/test_uploads.py
+++ b/tests/test_uploads.py
@@ -124,7 +124,7 @@ def stdin_processes(httpbin, *args):
 @pytest.mark.requires_external_processes
 @pytest.mark.skipif(is_windows, reason="Windows doesn't support select() calls into files")
 def test_reading_from_stdin(httpbin, wait):
-    with stdin_processes(httpbin) as (process_1, process_2):
+    with stdin_processes(httpbin, '--chunked') as (process_1, process_2):
         process_1.communicate(timeout=0.1, input=b"bleh")
         # Since there is data, it doesn't matter if there
         # you wait or not.
@@ -142,7 +142,7 @@ def test_reading_from_stdin(httpbin, wait):
 @pytest.mark.requires_external_processes
 @pytest.mark.skipif(is_windows, reason="Windows doesn't support select() calls into files")
 def test_stdin_read_warning(httpbin):
-    with stdin_processes(httpbin) as (process_1, process_2):
+    with stdin_processes(httpbin, '--chunked') as (process_1, process_2):
         # Wait before sending any data
         time.sleep(1)
         process_1.communicate(timeout=0.1, input=b"bleh\n")
@@ -158,7 +158,7 @@ def test_stdin_read_warning(httpbin):
 @pytest.mark.requires_external_processes
 @pytest.mark.skipif(is_windows, reason="Windows doesn't support select() calls into files")
 def test_stdin_read_warning_with_quiet(httpbin):
-    with stdin_processes(httpbin, "-qq") as (process_1, process_2):
+    with stdin_processes(httpbin, '--chunked', "-qq") as (process_1, process_2):
         # Wait before sending any data
         time.sleep(1)
         process_1.communicate(timeout=0.1, input=b"bleh\n")