diff --git a/app/models/champs/decimal_number_champ.rb b/app/models/champs/decimal_number_champ.rb
index dcfcea707..b22fb2379 100644
--- a/app/models/champs/decimal_number_champ.rb
+++ b/app/models/champs/decimal_number_champ.rb
@@ -1,5 +1,5 @@
 class Champs::DecimalNumberChamp < Champ
-  validates :value, numericality: { allow_nil: true }
+  validates :value, numericality: { allow_nil: true, allow_blank: true }
 
   def value_for_export
     value.to_f
diff --git a/app/models/champs/integer_number_champ.rb b/app/models/champs/integer_number_champ.rb
index d1e82ec4a..d7ca399a7 100644
--- a/app/models/champs/integer_number_champ.rb
+++ b/app/models/champs/integer_number_champ.rb
@@ -1,5 +1,5 @@
 class Champs::IntegerNumberChamp < Champ
-  validates :value, numericality: { only_integer: true, allow_nil: true }
+  validates :value, numericality: { only_integer: true, allow_nil: true, allow_blank: true }
 
   def value_for_export
     value.to_i
diff --git a/spec/models/champs/decimal_number_champ_spec.rb b/spec/models/champs/decimal_number_champ_spec.rb
index 3e3bb9c26..8ec0ebdaf 100644
--- a/spec/models/champs/decimal_number_champ_spec.rb
+++ b/spec/models/champs/decimal_number_champ_spec.rb
@@ -21,5 +21,17 @@ describe Champs::DecimalNumberChamp do
 
       it { is_expected.to_not be_valid }
     end
+
+    context 'when the value is blank' do
+      let(:value) { '' }
+
+      it { is_expected.to be_valid }
+    end
+
+    context 'when the value is nil' do
+      let(:value) { nil }
+
+      it { is_expected.to be_valid }
+    end
   end
 end
diff --git a/spec/models/champs/integer_number_champ_spec.rb b/spec/models/champs/integer_number_champ_spec.rb
index 957d5e5c6..6a7152759 100644
--- a/spec/models/champs/integer_number_champ_spec.rb
+++ b/spec/models/champs/integer_number_champ_spec.rb
@@ -21,5 +21,17 @@ describe Champs::IntegerNumberChamp do
 
       it { is_expected.to_not be_valid }
     end
+
+    context 'when the value is blank' do
+      let(:value) { '' }
+
+      it { is_expected.to be_valid }
+    end
+
+    context 'when the value is nil' do
+      let(:value) { nil }
+
+      it { is_expected.to be_valid }
+    end
   end
 end