diff --git a/gstreamer/src/clock_time.rs b/gstreamer/src/clock_time.rs
index 039cefc92..e2c14d7bc 100644
--- a/gstreamer/src/clock_time.rs
+++ b/gstreamer/src/clock_time.rs
@@ -98,7 +98,7 @@ macro_rules! impl_common_ops_for_opt_int(
                 }
             }
 
-            pub fn zero() -> Self {
+            pub const fn zero() -> Self {
                 Self(Some(0))
             }
 
@@ -106,7 +106,7 @@ macro_rules! impl_common_ops_for_opt_int(
                 matches!(self.0, Some(0))
             }
 
-            pub fn none() -> Self {
+            pub const fn none() -> Self {
                 Self(None)
             }
         }