diff --git a/mypy.ini b/mypy.ini
index 15d39693e5..dd095e4d13 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -54,7 +54,8 @@ ignore_missing_imports = True
 ignore_missing_imports = True
 [mypy-pure_eval.*]
 ignore_missing_imports = True
-
+[mypy-blinker.*]
+ignore_missing_imports = True
 [mypy-sentry_sdk._queue]
 ignore_missing_imports = True
 disallow_untyped_defs = False
diff --git a/sentry_sdk/integrations/flask.py b/sentry_sdk/integrations/flask.py
index 86fcd76a16..f6306e5a41 100644
--- a/sentry_sdk/integrations/flask.py
+++ b/sentry_sdk/integrations/flask.py
@@ -43,6 +43,10 @@
 except ImportError:
     raise DidNotEnable("Flask is not installed")
 
+try:
+    import blinker  # noqa
+except ImportError:
+    raise DidNotEnable("blinker is not installed")
 
 TRANSACTION_STYLE_VALUES = ("endpoint", "url")