diff --git a/src/Stripe.net/Infrastructure/FormEncoding/ContentEncoder.cs b/src/Stripe.net/Infrastructure/FormEncoding/ContentEncoder.cs
index 3bc7d8aa22..aeb2453cc8 100644
--- a/src/Stripe.net/Infrastructure/FormEncoding/ContentEncoder.cs
+++ b/src/Stripe.net/Infrastructure/FormEncoding/ContentEncoder.cs
@@ -163,6 +163,12 @@ private static List<KeyValuePair<string, object>> FlattenParamsValue(object valu
                     flatParams = SingleParam(keyPrefix, JsonUtils.SerializeObject(e).Trim('"'));
                     break;
 
+                case bool b:
+                    flatParams = SingleParam(
+                        keyPrefix,
+                        b ? "true" : "false");
+                    break;
+
                 default:
                     flatParams = SingleParam(
                         keyPrefix,
diff --git a/src/StripeTests/Infrastructure/FormEncoding/ContentEncoderTest.cs b/src/StripeTests/Infrastructure/FormEncoding/ContentEncoderTest.cs
index 09602f3268..2953e0eba0 100644
--- a/src/StripeTests/Infrastructure/FormEncoding/ContentEncoderTest.cs
+++ b/src/StripeTests/Infrastructure/FormEncoding/ContentEncoderTest.cs
@@ -205,7 +205,7 @@ public void CreateQueryString()
                     {
                         Bool = false,
                     },
-                    Want = "bool=False",
+                    Want = "bool=false",
                 },
                 new QueryStringTestCase
                 {
@@ -213,7 +213,7 @@ public void CreateQueryString()
                     {
                         Bool = true,
                     },
-                    Want = "bool=True",
+                    Want = "bool=true",
                 },
 
                 // DateRangeOptions
diff --git a/src/StripeTests/Services/PaymentIntents/PaymentIntentConfirmOptionsTest.cs b/src/StripeTests/Services/PaymentIntents/PaymentIntentConfirmOptionsTest.cs
index 9e9b6f01c8..2a049aefcb 100644
--- a/src/StripeTests/Services/PaymentIntents/PaymentIntentConfirmOptionsTest.cs
+++ b/src/StripeTests/Services/PaymentIntents/PaymentIntentConfirmOptionsTest.cs
@@ -14,7 +14,7 @@ public void SerializeObjectProperly()
                 OffSession = true,
             };
 
-            Assert.Equal("off_session=True", ContentEncoder.CreateQueryString(options_bool));
+            Assert.Equal("off_session=true", ContentEncoder.CreateQueryString(options_bool));
         }
     }
 }
diff --git a/src/StripeTests/Services/PaymentIntents/PaymentIntentCreateOptionsTest.cs b/src/StripeTests/Services/PaymentIntents/PaymentIntentCreateOptionsTest.cs
index 011ca022a0..ea099904b7 100644
--- a/src/StripeTests/Services/PaymentIntents/PaymentIntentCreateOptionsTest.cs
+++ b/src/StripeTests/Services/PaymentIntents/PaymentIntentCreateOptionsTest.cs
@@ -14,7 +14,7 @@ public void SerializeObjectProperly()
                 OffSession = true,
             };
 
-            Assert.Equal("off_session=True", ContentEncoder.CreateQueryString(options_bool));
+            Assert.Equal("off_session=true", ContentEncoder.CreateQueryString(options_bool));
         }
     }
 }