diff --git a/app/models/type_de_champ.rb b/app/models/type_de_champ.rb
index 87c5acba4..70fc4239c 100644
--- a/app/models/type_de_champ.rb
+++ b/app/models/type_de_champ.rb
@@ -649,6 +649,9 @@ class TypeDeChamp < ApplicationRecord
   end
 
   def invalid_regexp?
+    self.errors.delete(:expression_reguliere)
+    self.errors.delete(:expression_reguliere_exemple_text)
+
     return false if expression_reguliere.blank?
     return false if expression_reguliere_exemple_text.blank?
     return false if expression_reguliere_exemple_text.match?(Regexp.new(expression_reguliere, timeout: ExpressionReguliereValidator::TIMEOUT))
diff --git a/spec/models/type_de_champ_spec.rb b/spec/models/type_de_champ_spec.rb
index 9c96050b6..75fb08351 100644
--- a/spec/models/type_de_champ_spec.rb
+++ b/spec/models/type_de_champ_spec.rb
@@ -174,9 +174,13 @@ describe TypeDeChamp do
       let(:expression_reguliere_exemple_text) { "01234567" }
       let(:expression_reguliere) { "[A-Z]+" }
 
-      it "should add error message" do
+      it "should add only one error message" do
         expect(subject).to be_truthy
-        expect(tdc.errors.messages[:expression_reguliere_exemple_text]).to be_present
+        expect(tdc.errors.messages[:expression_reguliere_exemple_text].size).to eq(1)
+
+        tdc.invalid_regexp?
+
+        expect(tdc.errors.messages[:expression_reguliere_exemple_text].size).to eq(1)
       end
     end