diff --git a/b2sdk/_internal/b2http.py b/b2sdk/_internal/b2http.py
index 4044a1014..2f0df66a7 100644
--- a/b2sdk/_internal/b2http.py
+++ b/b2sdk/_internal/b2http.py
@@ -545,14 +545,16 @@ def _translate_errors(cls, fcn, post_params=None):
                     raise UnknownHost()
             elif isinstance(e1, requests.packages.urllib3.exceptions.ProtocolError):
                 e2 = e1.args[1]
+
+                if isinstance(e2, TimeoutError):
+                    raise B2RequestTimeout(str(e0))
+
                 if isinstance(e2, socket.error):
                     if len(e2.args) >= 2 and e2.args[1] == 'Broken pipe':
                         # Broken pipes are usually caused by the service rejecting
                         # an upload request for cause, so we use a 400 Bad Request
                         # code.
                         raise BrokenPipe()
-                elif isinstance(e2, TimeoutError):
-                    raise B2RequestTimeout(str(e0))
             raise B2ConnectionError(str(e0))
 
         except requests.Timeout as e:
diff --git a/changelog.d/+timeout_error.fixed.md b/changelog.d/+timeout_error.fixed.md
new file mode 100644
index 000000000..6423e4a5f
--- /dev/null
+++ b/changelog.d/+timeout_error.fixed.md
@@ -0,0 +1 @@
+Fix TimeoutError handling in `b2http`.
diff --git a/test/unit/b2http/test_b2http.py b/test/unit/b2http/test_b2http.py
index 7f3020c51..28ab4dad5 100644
--- a/test/unit/b2http/test_b2http.py
+++ b/test/unit/b2http/test_b2http.py
@@ -20,6 +20,7 @@
 from apiver_deps import USER_AGENT, B2Http, B2HttpApiConfig, ClockSkewHook
 from apiver_deps_exception import (
     B2ConnectionError,
+    B2RequestTimeout,
     BadDateFormat,
     BadJson,
     BadRequest,
@@ -80,6 +81,17 @@ def fcn():
         with pytest.raises(UnknownHost):
             B2Http._translate_errors(fcn)
 
+    def test_request_timeout(self):
+        def fcn():
+            raise requests.ConnectionError(
+                requests.packages.urllib3.exceptions.ProtocolError(
+                    'dummy', TimeoutError('The write operation timed out')
+                )
+            )
+
+        with pytest.raises(B2RequestTimeout):
+            B2Http._translate_errors(fcn)
+
     def test_connection_error(self):
         def fcn():
             raise requests.ConnectionError('a message')