diff --git a/tests/test.hpp b/tests/test.hpp
index 028da62..f2d6266 100644
--- a/tests/test.hpp
+++ b/tests/test.hpp
@@ -43,7 +43,7 @@ inline bool test_xpath_number(const pugi::xml_node& node, const char* query, dou
 {
 	pugi::xpath_query q(query);
 
-	return fabs(q.evaluate_number(node) - expected) < 1e-8f;
+	return fabs(q.evaluate_number(node) - expected) < 1e-16f;
 }
 
 inline bool test_xpath_number_nan(const pugi::xml_node& node, const char* query)
diff --git a/tests/test_xpath_parse.cpp b/tests/test_xpath_parse.cpp
index b7604f5..d9595c8 100644
--- a/tests/test_xpath_parse.cpp
+++ b/tests/test_xpath_parse.cpp
@@ -22,6 +22,7 @@ TEST(xpath_number_parse)
 	CHECK_XPATH_NUMBER(c, "123", 123);
 	CHECK_XPATH_NUMBER(c, "123.456", 123.456);
 	CHECK_XPATH_NUMBER(c, ".123", 0.123);
+	CHECK_XPATH_NUMBER(c, "123.4567890123456789012345", 123.4567890123456789012345);
 }
 
 TEST(xpath_number_error)