diff --git a/NEWS b/NEWS
index 92c2903a60c..40f246c9ad8 100644
--- a/NEWS
+++ b/NEWS
@@ -27,6 +27,9 @@ PHP                                                                        NEWS
   . Fixed bug #81226 (Integer overflow behavior is different with JIT
     enabled). (Dmitry)
 
+- Shmop:
+  . Fixed bug #81283 (shmop can't read beyond 2147483647 bytes). (cmb, Nikita)
+
 - Standard:
   . Fixed bug #72146 (Integer overflow on substr_replace). (cmb)
   . Fixed bug #81265 (getimagesize returns 0 for 256px ICO images).
diff --git a/ext/shmop/shmop.c b/ext/shmop/shmop.c
index 249359bbdd2..7ed37b4fb81 100644
--- a/ext/shmop/shmop.c
+++ b/ext/shmop/shmop.c
@@ -241,7 +241,7 @@ PHP_FUNCTION(shmop_read)
 		RETURN_THROWS();
 	}
 
-	if (count < 0 || start > (INT_MAX - count) || start + count > shmop->size) {
+	if (count < 0 || start > (ZEND_LONG_MAX - count) || start + count > shmop->size) {
 		zend_argument_value_error(3, "is out of range");
 		RETURN_THROWS();
 	}