diff --git a/freqtrade/optimize/hyperopt_auto.py b/freqtrade/optimize/hyperopt_auto.py
index 08269b092..fb8adfe6b 100644
--- a/freqtrade/optimize/hyperopt_auto.py
+++ b/freqtrade/optimize/hyperopt_auto.py
@@ -3,9 +3,12 @@ HyperOptAuto class.
 This module implements a convenience auto-hyperopt class, which can be used together with strategies
  that implement IHyperStrategy interface.
 """
+from contextlib import suppress
 from typing import Any, Callable, Dict, List
+
 from pandas import DataFrame
-from skopt.space import Categorical, Dimension, Integer, Real  # noqa
+with suppress(ImportError):
+    from skopt.space import Dimension
 
 from freqtrade.optimize.hyperopt_interface import IHyperOpt
 
@@ -57,23 +60,23 @@ class HyperOptAuto(IHyperOpt):
         else:
             return self._get_func(fallback_method_name)()
 
-    def indicator_space(self) -> List[Dimension]:
+    def indicator_space(self) -> List['Dimension']:
         return self._get_indicator_space('buy', 'indicator_space')
 
-    def sell_indicator_space(self) -> List[Dimension]:
+    def sell_indicator_space(self) -> List['Dimension']:
         return self._get_indicator_space('sell', 'sell_indicator_space')
 
     def generate_roi_table(self, params: Dict) -> Dict[int, float]:
         return self._get_func('generate_roi_table')(params)
 
-    def roi_space(self) -> List[Dimension]:
+    def roi_space(self) -> List['Dimension']:
         return self._get_func('roi_space')()
 
-    def stoploss_space(self) -> List[Dimension]:
+    def stoploss_space(self) -> List['Dimension']:
         return self._get_func('stoploss_space')()
 
     def generate_trailing_params(self, params: Dict) -> Dict:
         return self._get_func('generate_trailing_params')(params)
 
-    def trailing_space(self) -> List[Dimension]:
+    def trailing_space(self) -> List['Dimension']:
         return self._get_func('trailing_space')()
diff --git a/freqtrade/strategy/hyper.py b/freqtrade/strategy/hyper.py
index 53a0c6462..0378be1d5 100644
--- a/freqtrade/strategy/hyper.py
+++ b/freqtrade/strategy/hyper.py
@@ -2,9 +2,11 @@
 IHyperStrategy interface, hyperoptable Parameter class.
 This module defines a base class for auto-hyperoptable strategies.
 """
+from contextlib import suppress
 from typing import Iterator, Tuple, Any, Optional, Sequence, Union
 
-from skopt.space import Integer, Real, Categorical
+with suppress(ImportError):
+    from skopt.space import Integer, Real, Categorical
 
 from freqtrade.exceptions import OperationalException
 
@@ -38,7 +40,7 @@ class BaseParameter(object):
     def __repr__(self):
         return f'{self.__class__.__name__}({self.value})'
 
-    def get_space(self, name: str) -> Union[Integer, Real, Categorical]:
+    def get_space(self, name: str) -> Union['Integer', 'Real', 'Categorical']:
         raise NotImplementedError()
 
 
@@ -62,7 +64,7 @@ class IntParameter(BaseParameter):
             raise OperationalException('IntParameter space must be [min, max]')
         super().__init__(space=space, default=default, category=category, **kwargs)
 
-    def get_space(self, name: str) -> Integer:
+    def get_space(self, name: str) -> 'Integer':
         """
         Create skopt optimization space.
         :param name: A name of parameter field.
@@ -90,7 +92,7 @@ class FloatParameter(BaseParameter):
             raise OperationalException('IntParameter space must be [min, max]')
         super().__init__(space=space, default=default, category=category, **kwargs)
 
-    def get_space(self, name: str) -> Real:
+    def get_space(self, name: str) -> 'Real':
         """
         Create skopt optimization space.
         :param name: A name of parameter field.
@@ -121,7 +123,7 @@ class CategoricalParameter(BaseParameter):
                 'IntParameter space must be [a, b, ...] (at least two parameters)')
         super().__init__(space=space, default=default, category=category, **kwargs)
 
-    def get_space(self, name: str) -> Categorical:
+    def get_space(self, name: str) -> 'Categorical':
         """
         Create skopt optimization space.
         :param name: A name of parameter field.