diff --git a/ext/standard/math.c b/ext/standard/math.c
index a633789cf0150..6ffa6a07c8607 100644
--- a/ext/standard/math.c
+++ b/ext/standard/math.c
@@ -199,7 +199,7 @@ PHPAPI double _php_math_round(double value, int places, int mode) {
 	fesetround(cpu_round_mode);
 
 	/* This value is beyond our precision, so rounding it is pointless */
-	if (fabs(tmp_value) >= 1e15) {
+	if (fabs(tmp_value) >= 1e16) {
 		return value;
 	}
 
diff --git a/ext/standard/tests/math/round_gh12143_expand-rounding-target.phpt b/ext/standard/tests/math/round_gh12143_expand-rounding-target.phpt
index 472d6a35f617d..71b3dc34f8fec 100644
--- a/ext/standard/tests/math/round_gh12143_expand-rounding-target.phpt
+++ b/ext/standard/tests/math/round_gh12143_expand-rounding-target.phpt
@@ -82,65 +82,65 @@ foreach ($testCases as $mode => $cases) {
 ?>
 --EXPECT--
 ========== PHP_ROUND_HALF_UP ==========
-float(0.12345678901234565)
-float(-0.12345678901234565)
-float(12345678901234564)
-float(-12345678901234564)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(0.1234567890123457)
+float(-0.1234567890123457)
+float(12345678901234570)
+float(-12345678901234570)
+float(4503599627370496)
+float(-4503599627370496)
 
 ========== PHP_ROUND_HALF_DOWN ==========
-float(0.12345678901234565)
-float(-0.12345678901234565)
-float(12345678901234564)
-float(-12345678901234564)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(0.1234567890123456)
+float(-0.1234567890123456)
+float(12345678901234560)
+float(-12345678901234560)
+float(4503599627370495)
+float(-4503599627370495)
 
 ========== PHP_ROUND_HALF_EVEN ==========
-float(0.12345678901234565)
-float(-0.12345678901234565)
-float(12345678901234564)
-float(-12345678901234564)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(0.1234567890123456)
+float(-0.1234567890123456)
+float(12345678901234560)
+float(-12345678901234560)
+float(4503599627370496)
+float(-4503599627370496)
 
 ========== PHP_ROUND_HALF_ODD ==========
-float(0.12345678901234565)
-float(-0.12345678901234565)
-float(12345678901234564)
-float(-12345678901234564)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(0.1234567890123457)
+float(-0.1234567890123457)
+float(12345678901234570)
+float(-12345678901234570)
+float(4503599627370495)
+float(-4503599627370495)
 
 ========== PHP_ROUND_AWAY_FROM_ZERO ==========
 float(0.1234567890123456)
 float(-0.1234567890123456)
-float(12345678901234568)
-float(-12345678901234568)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(12345678901234570)
+float(-12345678901234570)
+float(4503599627370496)
+float(-4503599627370496)
 
 ========== PHP_ROUND_TOWARD_ZERO ==========
-float(0.12345678901234566)
-float(-0.12345678901234566)
-float(12345678901234564)
-float(-12345678901234564)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(0.1234567890123456)
+float(-0.1234567890123456)
+float(12345678901234560)
+float(-12345678901234560)
+float(4503599627370495)
+float(-4503599627370495)
 
 ========== PHP_ROUND_CEILING ==========
 float(0.1234567890123456)
 float(-0.1234567890123456)
-float(12345678901234564)
-float(-12345678901234564)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(12345678901234570)
+float(-12345678901234560)
+float(4503599627370496)
+float(-4503599627370495)
 
 ========== PHP_ROUND_FLOOR ==========
 float(0.1234567890123456)
 float(-0.1234567890123456)
-float(12345678901234564)
-float(-12345678901234564)
-float(4503599627370495.5)
-float(-4503599627370495.5)
+float(12345678901234560)
+float(-12345678901234570)
+float(4503599627370495)
+float(-4503599627370496)