diff --git a/timecop.stub.php b/timecop.stub.php
index 11bbcd0..e32ebaa 100644
--- a/timecop.stub.php
+++ b/timecop.stub.php
@@ -26,7 +26,7 @@
 
 // Use build/gen_stub.php from PHP 8 source code checkout to create .h contents.
 
-function timecop_freeze(\DateTimeInterface|int $timestamp): true {}
-function timecop_travel(\DateTimeInterface|int $timestamp): true {}
+function timecop_freeze(\DateTimeInterface|int $timestamp): bool {}
+function timecop_travel(\DateTimeInterface|int $timestamp): bool {}
 function timecop_scale(int $scale): bool {}
-function timecop_return(): true {}
+function timecop_return(): bool {}
diff --git a/timecop_php8_arginfo.h b/timecop_php8_arginfo.h
index abf51b6..1b5720c 100644
--- a/timecop_php8_arginfo.h
+++ b/timecop_php8_arginfo.h
@@ -23,7 +23,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
  */
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_timecop_freeze, 0, 1, true, 0)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_timecop_freeze, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_TYPE_MASK(0, timestamp, DateTimeInterface, MAY_BE_LONG, NULL)
 ZEND_END_ARG_INFO()
 
@@ -33,7 +33,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_timecop_scale, 0, 1, _IS_BOOL, 0
 	ZEND_ARG_TYPE_INFO(0, scale, IS_LONG, 0)
 ZEND_END_ARG_INFO()
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_timecop_return, 0, 0, true, 0)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_timecop_return, 0, 0, _IS_BOOL, 0)
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_timecop_time, 0, 0, IS_LONG, 0)