diff --git a/Zend/zend_bitset.h b/Zend/zend_bitset.h
index a42b35712f4e6..d990b6a2a871e 100644
--- a/Zend/zend_bitset.h
+++ b/Zend/zend_bitset.h
@@ -60,7 +60,6 @@ ZEND_ATTRIBUTE_CONST static zend_always_inline int zend_ulong_ntz(zend_ulong num
 #else
 	if (!BitScanForward(&index, num)) {
 #endif
-		/* undefined behavior */
 		return SIZEOF_ZEND_LONG * 8;
 	}
 
@@ -98,7 +97,6 @@ ZEND_ATTRIBUTE_CONST static zend_always_inline int zend_ulong_nlz(zend_ulong num
 #else
 	if (!BitScanReverse(&index, num)) {
 #endif
-		/* undefined behavior */
 		return SIZEOF_ZEND_LONG * 8;
 	}