diff --git a/spec/grape/validations/types/primitive_coercer_spec.rb b/spec/grape/validations/types/primitive_coercer_spec.rb
index 987ab11ec2..d215bf3325 100644
--- a/spec/grape/validations/types/primitive_coercer_spec.rb
+++ b/spec/grape/validations/types/primitive_coercer_spec.rb
@@ -11,8 +11,20 @@
     context 'Boolean' do
       let(:type) { Grape::API::Boolean }
 
-      it 'coerces to Boolean' do
-        expect(subject.call(0)).to eq(false)
+      [true, 'true', 1].each do |val|
+        it "coerces '#{val}' to true" do
+          expect(subject.call(val)).to eq(true)
+        end
+      end
+
+      [false, 'false', 0].each do |val|
+        it "coerces '#{val}' to false" do
+          expect(subject.call(val)).to eq(false)
+        end
+      end
+
+      it 'returns an error when the given value cannot be coerced' do
+        expect(subject.call(123)).to be_instance_of(Grape::Validations::Types::InvalidValue)
       end
     end
 
diff --git a/spec/grape/validations/validators/coerce_spec.rb b/spec/grape/validations/validators/coerce_spec.rb
index d3c9ed7bf7..dbf57c9d57 100644
--- a/spec/grape/validations/validators/coerce_spec.rb
+++ b/spec/grape/validations/validators/coerce_spec.rb
@@ -294,66 +294,17 @@ def self.parsed?(value)
         end
       end
 
-      it 'Bool' do
-        subject.params do
-          requires :bool, coerce: Grape::API::Boolean
-        end
-        subject.get '/bool' do
-          params[:bool].class
-        end
-
-        get '/bool', bool: 1
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('TrueClass')
-
-        get '/bool', bool: 0
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('FalseClass')
-
-        get '/bool', bool: 'false'
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('FalseClass')
-
-        get '/bool', bool: 'true'
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('TrueClass')
-      end
-
       it 'Boolean' do
         subject.params do
-          optional :boolean, type: Boolean, default: true
+          requires :boolean, type: Boolean
         end
         subject.get '/boolean' do
           params[:boolean].class
         end
 
-        get '/boolean'
+        get '/boolean', boolean: 1
         expect(last_response.status).to eq(200)
         expect(last_response.body).to eq('TrueClass')
-
-        get '/boolean', boolean: true
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('TrueClass')
-
-        get '/boolean', boolean: false
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('FalseClass')
-
-        get '/boolean', boolean: 'true'
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('TrueClass')
-
-        get '/boolean', boolean: 'false'
-        expect(last_response.status).to eq(200)
-        expect(last_response.body).to eq('FalseClass')
-
-        get '/boolean', boolean: 123
-        expect(last_response.status).to eq(400)
-        expect(last_response.body).to eq('boolean is invalid')
-
-        get '/boolean', boolean: '123'
-        expect(last_response.status).to eq(400)
-        expect(last_response.body).to eq('boolean is invalid')
       end
 
       it 'Rack::Multipart::UploadedFile' do