diff --git a/sys/decklink/gstdecklinkvideosink.cpp b/sys/decklink/gstdecklinkvideosink.cpp
index db7fa9d5b3..6fbcb34a70 100644
--- a/sys/decklink/gstdecklinkvideosink.cpp
+++ b/sys/decklink/gstdecklinkvideosink.cpp
@@ -483,15 +483,9 @@ convert_to_internal_clock (GstDecklinkVideoSink * self,
       // according to our internal clock.
       //
       // For the duration we just scale
-      if (external > external_timestamp) {
-        guint64 diff = external - external_timestamp;
-        diff = gst_util_uint64_scale (diff, rate_d, rate_n);
-        *timestamp = internal - diff;
-      } else {
-        guint64 diff = external_timestamp - external;
-        diff = gst_util_uint64_scale (diff, rate_d, rate_n);
-        *timestamp = internal + diff;
-      }
+      *timestamp =
+          gst_clock_unadjust_with_calibration (NULL, external_timestamp,
+          internal, external, rate_n, rate_d);
 
       GST_LOG_OBJECT (self,
           "Converted %" GST_TIME_FORMAT " to %" GST_TIME_FORMAT " (internal: %"
diff --git a/sys/decklink/gstdecklinkvideosrc.cpp b/sys/decklink/gstdecklinkvideosrc.cpp
index d82c5fc730..0e8103406d 100644
--- a/sys/decklink/gstdecklinkvideosrc.cpp
+++ b/sys/decklink/gstdecklinkvideosrc.cpp
@@ -464,15 +464,9 @@ gst_decklink_video_src_convert_to_external_clock (GstDecklinkVideoSrc * self,
       // according to our external clock.
       //
       // For the duration we just scale
-      if (internal > internal_timestamp) {
-        guint64 diff = internal - internal_timestamp;
-        diff = gst_util_uint64_scale (diff, rate_n, rate_d);
-        *timestamp = external - diff;
-      } else {
-        guint64 diff = internal_timestamp - internal;
-        diff = gst_util_uint64_scale (diff, rate_n, rate_d);
-        *timestamp = external + diff;
-      }
+      *timestamp =
+          gst_clock_adjust_with_calibration (NULL, internal_timestamp, internal,
+          external, rate_n, rate_d);
 
       GST_LOG_OBJECT (self,
           "Converted %" GST_TIME_FORMAT " to %" GST_TIME_FORMAT " (external: %"