diff --git a/model_compression_toolkit/core/keras/default_framework_info.py b/model_compression_toolkit/core/keras/default_framework_info.py
index df4014405..d26efed71 100644
--- a/model_compression_toolkit/core/keras/default_framework_info.py
+++ b/model_compression_toolkit/core/keras/default_framework_info.py
@@ -29,7 +29,7 @@
 from model_compression_toolkit.target_platform_capabilities.target_platform import QuantizationMethod
 from model_compression_toolkit.constants import SOFTMAX_THRESHOLD
 from model_compression_toolkit.core.keras.constants import SOFTMAX, LINEAR, RELU, SWISH, SIGMOID, IDENTITY, TANH, SELU, \
-    KERNEL, DEPTHWISE_KERNEL
+    KERNEL, DEPTHWISE_KERNEL, GELU
 from model_compression_toolkit.core.keras.quantizer.fake_quant_builder import power_of_two_quantization, symmetric_quantization, uniform_quantization
 
 """
@@ -75,7 +75,8 @@
                      TANH: (-1, 1),
                      SWISH: (-0.279, None),
                      RELU: (0, None),
-                     SELU: (None, None),
+                     SELU: (-1.76, None),
+                     GELU: (-0.17, None),
                      }
 
 """
diff --git a/model_compression_toolkit/core/pytorch/default_framework_info.py b/model_compression_toolkit/core/pytorch/default_framework_info.py
index 1c5961464..f3d965182 100644
--- a/model_compression_toolkit/core/pytorch/default_framework_info.py
+++ b/model_compression_toolkit/core/pytorch/default_framework_info.py
@@ -12,8 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ==============================================================================
-from torch.nn import Hardsigmoid, ReLU, ReLU6, Softmax, Sigmoid
-from torch.nn.functional import hardsigmoid, relu, relu6, softmax
+from torch.nn import Hardsigmoid, ReLU, ReLU6, Softmax, Sigmoid, GELU, SELU
+from torch.nn.functional import hardsigmoid, relu, relu6, softmax, gelu, selu
 from torch.nn import Conv2d, ConvTranspose2d, Linear
 from torch import sigmoid
 
@@ -74,7 +74,12 @@
                 ReLU: (0, None),
                 relu: (0, None),
                 ReLU6: (0, None),
-                relu6: (0, None)}
+                relu6: (0, None),
+                GELU: (-0.17, None),
+                gelu: (-0.17, None),
+                SELU: (-1.76, None),
+                selu: (-1.76, None),
+                }
 
 """
 Mapping from a QuantizationMethod to an activation quantizer function.
diff --git a/model_compression_toolkit/core/pytorch/graph_substitutions/substitutions/shift_negative_activation.py b/model_compression_toolkit/core/pytorch/graph_substitutions/substitutions/shift_negative_activation.py
index 5fbeb5b8d..6b7b6279c 100644
--- a/model_compression_toolkit/core/pytorch/graph_substitutions/substitutions/shift_negative_activation.py
+++ b/model_compression_toolkit/core/pytorch/graph_substitutions/substitutions/shift_negative_activation.py
@@ -17,9 +17,9 @@
 
 import numpy as np
 import torch.nn.functional
-from torch.nn import Conv2d, Linear, PReLU, ELU, Hardswish, Dropout, ZeroPad2d, SiLU
+from torch.nn import Conv2d, Linear, PReLU, ELU, Hardswish, Dropout, ZeroPad2d, SiLU, GELU
 from torch import reshape
-from torch.nn.functional import hardswish, silu, prelu, elu
+from torch.nn.functional import hardswish, silu, prelu, elu, gelu
 from torch.nn.functional import avg_pool2d
 
 from model_compression_toolkit.core import CoreConfig, FrameworkInfo
@@ -68,7 +68,9 @@ def shift_negative_activation_node_matchers():
                NodeOperationMatcher(Hardswish) | \
                NodeOperationMatcher(hardswish) | \
                NodeOperationMatcher(SiLU) | \
-               NodeOperationMatcher(silu)
+               NodeOperationMatcher(silu) | \
+               NodeOperationMatcher(GELU) | \
+               NodeOperationMatcher(gelu)
 
     # Match linear layers where we can add a correction.
     linear_node = NodeOperationMatcher(Conv2d) | \
diff --git a/tests/pytorch_tests/model_tests/feature_models/shift_negative_activation_test.py b/tests/pytorch_tests/model_tests/feature_models/shift_negative_activation_test.py
index 1f89fe638..7145b248f 100644
--- a/tests/pytorch_tests/model_tests/feature_models/shift_negative_activation_test.py
+++ b/tests/pytorch_tests/model_tests/feature_models/shift_negative_activation_test.py
@@ -27,11 +27,11 @@
 
 
 class ShiftNegaviteActivationNet(torch.nn.Module):
-    def __init__(self):
+    def __init__(self, activation_layer):
         super(ShiftNegaviteActivationNet, self).__init__()
         self.conv1 = torch.nn.Conv2d(3, 4, kernel_size=(5,6), stride=2)
         self.conv2 = torch.nn.Conv2d(4, 5, kernel_size=(8,7), stride=2, bias=False)
-        self.activation = torch.nn.Hardswish()
+        self.activation = activation_layer()
 
     def forward(self, inp):
         x0 = self.conv1(inp)
@@ -45,8 +45,9 @@ class ShiftNegaviteActivationNetTest(BasePytorchTest):
     """
     This test checks the shift negative activation feature.
     """
-    def __init__(self, unit_test, float_reconstruction_error=1e-6):
+    def __init__(self, unit_test, float_reconstruction_error=1e-6, activation_layer=torch.nn.Hardswish):
         super().__init__(unit_test, float_reconstruction_error)
+        self.activation_layer = activation_layer
 
     @staticmethod
     def generate_inputs(input_shapes):
@@ -74,4 +75,9 @@ def create_inputs_shape(self):
         return [[self.val_batch_size, 3, 224, 224]]
 
     def create_feature_network(self, input_shape):
-        return ShiftNegaviteActivationNet()
\ No newline at end of file
+        return ShiftNegaviteActivationNet(self.activation_layer)
+
+    def compare(self, quantized_models, float_model, input_x=None, quantization_info=None):
+        super()
+        q_nodes = quantized_models['all_8bit'].node_sort
+        assert "activation_post_add" in [n.name for n in q_nodes], "Add operator haven't been added after activation operator"
diff --git a/tests/pytorch_tests/model_tests/test_feature_models_runner.py b/tests/pytorch_tests/model_tests/test_feature_models_runner.py
index ea55eb81b..93ca341b6 100644
--- a/tests/pytorch_tests/model_tests/test_feature_models_runner.py
+++ b/tests/pytorch_tests/model_tests/test_feature_models_runner.py
@@ -425,7 +425,8 @@ def test_shift_negative_activation_net(self):
         """
         This test checks the shift negative activation feature.
         """
-        ShiftNegaviteActivationNetTest(self).run_test(seed=3)
+        for activation_layer in [torch.nn.Hardswish, torch.nn.GELU]:
+            ShiftNegaviteActivationNetTest(self, activation_layer=activation_layer).run_test(seed=3)
 
     def test_split_concat_net(self):
         """