diff --git a/src/jsonschema/default_compiler_draft4.h b/src/jsonschema/default_compiler_draft4.h
index 66bac162b..828d92381 100644
--- a/src/jsonschema/default_compiler_draft4.h
+++ b/src/jsonschema/default_compiler_draft4.h
@@ -548,7 +548,7 @@ auto compiler_draft4_validation_uniqueitems(
 
 auto compiler_draft4_validation_maxlength(const SchemaCompilerContext &context)
     -> SchemaCompilerTemplate {
-  assert(context.value.is_integer());
+  assert(context.value.is_integer() || context.value.is_integer_real());
   assert(context.value.is_positive());
 
   // TODO: As an optimization, if `minLength` is set to the same number, do
@@ -556,14 +556,14 @@ auto compiler_draft4_validation_maxlength(const SchemaCompilerContext &context)
   return {make<SchemaCompilerAssertionSizeLess>(
       context,
       SchemaCompilerValueUnsignedInteger{
-          static_cast<unsigned long>(context.value.to_integer()) + 1},
+          static_cast<unsigned long>(context.value.as_integer()) + 1},
       type_condition(context, JSON::Type::String),
       SchemaCompilerTargetType::Instance)};
 }
 
 auto compiler_draft4_validation_minlength(const SchemaCompilerContext &context)
     -> SchemaCompilerTemplate {
-  assert(context.value.is_integer());
+  assert(context.value.is_integer() || context.value.is_integer_real());
   assert(context.value.is_positive());
 
   // TODO: As an optimization, if `maxLength` is set to the same number, do
@@ -571,14 +571,14 @@ auto compiler_draft4_validation_minlength(const SchemaCompilerContext &context)
   return {make<SchemaCompilerAssertionSizeGreater>(
       context,
       SchemaCompilerValueUnsignedInteger{
-          static_cast<unsigned long>(context.value.to_integer()) - 1},
+          static_cast<unsigned long>(context.value.as_integer()) - 1},
       type_condition(context, JSON::Type::String),
       SchemaCompilerTargetType::Instance)};
 }
 
 auto compiler_draft4_validation_maxitems(const SchemaCompilerContext &context)
     -> SchemaCompilerTemplate {
-  assert(context.value.is_integer());
+  assert(context.value.is_integer() || context.value.is_integer_real());
   assert(context.value.is_positive());
 
   // TODO: As an optimization, if `minItems` is set to the same number, do
@@ -586,14 +586,14 @@ auto compiler_draft4_validation_maxitems(const SchemaCompilerContext &context)
   return {make<SchemaCompilerAssertionSizeLess>(
       context,
       SchemaCompilerValueUnsignedInteger{
-          static_cast<unsigned long>(context.value.to_integer()) + 1},
+          static_cast<unsigned long>(context.value.as_integer()) + 1},
       type_condition(context, JSON::Type::Array),
       SchemaCompilerTargetType::Instance)};
 }
 
 auto compiler_draft4_validation_minitems(const SchemaCompilerContext &context)
     -> SchemaCompilerTemplate {
-  assert(context.value.is_integer());
+  assert(context.value.is_integer() || context.value.is_integer_real());
   assert(context.value.is_positive());
 
   // TODO: As an optimization, if `maxItems` is set to the same number, do
@@ -601,14 +601,14 @@ auto compiler_draft4_validation_minitems(const SchemaCompilerContext &context)
   return {make<SchemaCompilerAssertionSizeGreater>(
       context,
       SchemaCompilerValueUnsignedInteger{
-          static_cast<unsigned long>(context.value.to_integer()) - 1},
+          static_cast<unsigned long>(context.value.as_integer()) - 1},
       type_condition(context, JSON::Type::Array),
       SchemaCompilerTargetType::Instance)};
 }
 
 auto compiler_draft4_validation_maxproperties(
     const SchemaCompilerContext &context) -> SchemaCompilerTemplate {
-  assert(context.value.is_integer());
+  assert(context.value.is_integer() || context.value.is_integer_real());
   assert(context.value.is_positive());
 
   // TODO: As an optimization, if `minProperties` is set to the same number, do
@@ -616,14 +616,14 @@ auto compiler_draft4_validation_maxproperties(
   return {make<SchemaCompilerAssertionSizeLess>(
       context,
       SchemaCompilerValueUnsignedInteger{
-          static_cast<unsigned long>(context.value.to_integer()) + 1},
+          static_cast<unsigned long>(context.value.as_integer()) + 1},
       type_condition(context, JSON::Type::Object),
       SchemaCompilerTargetType::Instance)};
 }
 
 auto compiler_draft4_validation_minproperties(
     const SchemaCompilerContext &context) -> SchemaCompilerTemplate {
-  assert(context.value.is_integer());
+  assert(context.value.is_integer() || context.value.is_integer_real());
   assert(context.value.is_positive());
 
   // TODO: As an optimization, if `maxProperties` is set to the same number, do
@@ -631,7 +631,7 @@ auto compiler_draft4_validation_minproperties(
   return {make<SchemaCompilerAssertionSizeGreater>(
       context,
       SchemaCompilerValueUnsignedInteger{
-          static_cast<unsigned long>(context.value.to_integer()) - 1},
+          static_cast<unsigned long>(context.value.as_integer()) - 1},
       type_condition(context, JSON::Type::Object),
       SchemaCompilerTargetType::Instance)};
 }