diff --git a/docs/changelog.rst b/docs/changelog.rst
index e832417b98..5b085bbfc7 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -13,6 +13,7 @@ Fixed
 - Crash on non latin-1 encodable value in ``auth`` CLI option. `#404`_
 - Crash on invalid value in ``header`` CLI options. `#405`_
 - Crash on some invalid URLs in ``schema`` CLI option. `#406`_
+- Validation of ``--request-timeout`` parameter. `#407`_
 
 `0.24.1`_ - 2020-02-08
 ----------------------
@@ -695,6 +696,7 @@ Fixed
 .. _0.3.0: https://github.com/kiwicom/schemathesis/compare/v0.2.0...v0.3.0
 .. _0.2.0: https://github.com/kiwicom/schemathesis/compare/v0.1.0...v0.2.0
 
+.. _#407: https://github.com/kiwicom/schemathesis/issues/407
 .. _#406: https://github.com/kiwicom/schemathesis/issues/406
 .. _#405: https://github.com/kiwicom/schemathesis/issues/405
 .. _#404: https://github.com/kiwicom/schemathesis/issues/404
diff --git a/src/schemathesis/cli/__init__.py b/src/schemathesis/cli/__init__.py
index 0bb351d233..a339b0d5ce 100644
--- a/src/schemathesis/cli/__init__.py
+++ b/src/schemathesis/cli/__init__.py
@@ -113,7 +113,11 @@ def schemathesis(pre_run: Optional[str] = None) -> None:
     callback=callbacks.validate_base_url,
 )
 @click.option("--app", help="WSGI application to test", type=str, callback=callbacks.validate_app)
-@click.option("--request-timeout", help="Timeout in milliseconds for network requests during the test run.", type=int)
+@click.option(
+    "--request-timeout",
+    help="Timeout in milliseconds for network requests during the test run.",
+    type=click.IntRange(1),
+)
 @click.option("--validate-schema", help="Enable or disable validation of input schema.", type=bool, default=True)
 @click.option("--show-errors-tracebacks", help="Show full tracebacks for internal errors.", is_flag=True, default=False)
 @click.option(
diff --git a/test/cli/test_commands.py b/test/cli/test_commands.py
index dc6353d608..13cb137c97 100644
--- a/test/cli/test_commands.py
+++ b/test/cli/test_commands.py
@@ -59,6 +59,14 @@ def test_commands_version(cli):
         (("run", SIMPLE_PATH), 'Error: Missing argument, "--base-url" is required for SCHEMA specified by file.'),
         (("run", SIMPLE_PATH, "--base-url=test"), "Error: Invalid base URL"),
         (("run", SIMPLE_PATH, "--base-url=127.0.0.1:8080"), "Error: Invalid base URL"),
+        (
+            ("run", "http://127.0.0.1", "--request-timeout=-5"),
+            'Error: Invalid value for "--request-timeout": -5 is smaller than the minimum valid value 1.',
+        ),
+        (
+            ("run", "http://127.0.0.1", "--request-timeout=0"),
+            'Error: Invalid value for "--request-timeout": 0 is smaller than the minimum valid value 1.',
+        ),
         (
             ("run", "http://127.0.0.1", "--method=+"),
             'Error: Invalid value for "--method" / "-M": Invalid regex: nothing to repeat at position 0',
@@ -157,7 +165,8 @@ def test_commands_run_help(cli):
         "  -b, --base-url TEXT             Base URL address of the API, required for",
         "                                  SCHEMA if specified by file.",
         "  --app TEXT                      WSGI application to test",
-        "  --request-timeout INTEGER       Timeout in milliseconds for network requests",
+        "  --request-timeout INTEGER RANGE",
+        "                                  Timeout in milliseconds for network requests",
         "                                  during the test run.",
         "  --validate-schema BOOLEAN       Enable or disable validation of input schema.",
         "  --show-errors-tracebacks        Show full tracebacks for internal errors.",