diff --git a/src/backends/native/meta-crtc-kms.c b/src/backends/native/meta-crtc-kms.c
index de13905a7..9501fc839 100644
--- a/src/backends/native/meta-crtc-kms.c
+++ b/src/backends/native/meta-crtc-kms.c
@@ -186,14 +186,14 @@ meta_crtc_kms_set_mode (MetaCrtcKms   *crtc_kms,
 
       mode = meta_crtc_mode_kms_get_drm_mode (crtc_mode_kms);
 
-      g_debug ("Setting CRTC (%ld) mode to %s",
+      g_debug ("Setting CRTC (%" G_GUINT64_FORMAT ") mode to %s",
                meta_crtc_get_id (crtc), mode->name);
     }
   else
     {
       mode = NULL;
 
-      g_debug ("Unsetting CRTC (%ld) mode",
+      g_debug ("Unsetting CRTC (%" G_GUINT64_FORMAT ") mode",
                meta_crtc_get_id (crtc));
     }
 
diff --git a/src/backends/native/meta-monitor-manager-kms.c b/src/backends/native/meta-monitor-manager-kms.c
index 02d5c65cc..b57f98c92 100644
--- a/src/backends/native/meta-monitor-manager-kms.c
+++ b/src/backends/native/meta-monitor-manager-kms.c
@@ -414,7 +414,7 @@ meta_monitor_manager_kms_set_crtc_gamma (MetaMonitorManager *manager,
   g_autoptr (MetaKmsFeedback) kms_feedback = NULL;
 
   gamma_ramp_string = generate_gamma_ramp_string (size, red, green, blue);
-  g_debug ("Setting CRTC (%ld) gamma to %s",
+  g_debug ("Setting CRTC (%" G_GUINT64_FORMAT ") gamma to %s",
            meta_crtc_get_id (crtc), gamma_ramp_string);
 
   kms_update = meta_kms_ensure_pending_update (kms);