diff --git a/src/IO/ReadHelpers.h b/src/IO/ReadHelpers.h
index bdfb1f5d33e..47e574416ce 100644
--- a/src/IO/ReadHelpers.h
+++ b/src/IO/ReadHelpers.h
@@ -331,12 +331,24 @@ ReturnType readIntTextImpl(T & x, ReadBuffer & buf)
 
                     if (buf.count() - initial_pos + 1 >= std::numeric_limits<T>::max_digits10)
                     {
-                        T signed_res = negative ? -res : res;
-                        if (common::mulOverflow<T>(signed_res, 10, signed_res) || (negative ? common::subOverflow<T>(signed_res, (*buf.position() - '0'), signed_res) : 
-                            common::addOverflow<T>(signed_res, (*buf.position() - '0'), signed_res)))
-                            return ReturnType(false);
+                        if (negative)
+                        {
+                            T signed_res = -res;
+                            if (common::mulOverflow<T>(signed_res, 10, signed_res) ||
+                                common::subOverflow<T>(signed_res, (*buf.position() - '0'), signed_res))
+                                return ReturnType(false);
 
-                        res = negative ? -signed_res : signed_res;
+                            res = -signed_res;
+                        }
+                        else
+                        {
+                            T signed_res = res;
+                            if (common::mulOverflow<T>(signed_res, 10, signed_res)
+                                || common::addOverflow<T>(signed_res, (*buf.position() - '0'), signed_res))
+                                return ReturnType(false);
+
+                            res = signed_res;
+                        }
                         break;
                     }
                 }
diff --git a/tests/queries/0_stateless/2020_cast_integer_overflow.reference b/tests/queries/0_stateless/2020_cast_integer_overflow.reference
new file mode 100644
index 00000000000..acceae4a72e
--- /dev/null
+++ b/tests/queries/0_stateless/2020_cast_integer_overflow.reference
@@ -0,0 +1,2 @@
+-2147483648
+-2147483648
diff --git a/tests/queries/0_stateless/2020_cast_integer_overflow.sql b/tests/queries/0_stateless/2020_cast_integer_overflow.sql
new file mode 100644
index 00000000000..57aeff9a982
--- /dev/null
+++ b/tests/queries/0_stateless/2020_cast_integer_overflow.sql
@@ -0,0 +1,2 @@
+SELECT toInt32('-2147483648');
+SELECT toInt32OrNull('-2147483648');