diff --git a/examples/gallery/embellishments/colorbars_multiple.py b/examples/gallery/embellishments/colorbars_multiple.py
index 2aec9d11c31..1781816209a 100644
--- a/examples/gallery/embellishments/colorbars_multiple.py
+++ b/examples/gallery/embellishments/colorbars_multiple.py
@@ -28,7 +28,7 @@
         pygmt.makecpt(cmap="geo", series=[-8000, 8000])
         # "R?" means Winkel Tripel projection with map width automatically
         # determined from the subplot width.
-        fig.grdimage(grid=grid_globe, projection="R?", region="g", frame=True)
+        fig.grdimage(grid=grid_globe, projection="R?", region="g", frame="a")
         fig.colorbar(frame=["a4000f2000", "x+lElevation", "y+lm"])
     # Activate the second panel so that the colormap created by the makecpt
     # method is a panel-level CPT
@@ -36,9 +36,7 @@
         pygmt.makecpt(cmap="globe", series=[-6000, 3000])
         # "M?" means Mercator projection with map width also automatically
         # determined from the subplot width.
-        fig.grdimage(
-            grid=grid_subset, projection="M?", region=subset_region, frame=True
-        )
+        fig.grdimage(grid=grid_subset, projection="M?", region=subset_region, frame="a")
         fig.colorbar(frame=["a2000f1000", "x+lElevation", "y+lm"])
 
 fig.show()