diff --git a/pygmt/datasets/tile_map.py b/pygmt/datasets/tile_map.py
index e0702b2f1af..cebceb2e79f 100644
--- a/pygmt/datasets/tile_map.py
+++ b/pygmt/datasets/tile_map.py
@@ -113,7 +113,7 @@ def load_tile_map(region, zoom="auto", source=None, lonlat=True, wait=0, max_ret
         raise ModuleNotFoundError(
             "Package `contextily` is required to be installed to use this function. "
             "Please use `pip install contextily` or "
-            "`conda install -c conda-forge contextily` "
+            "`mamba install -c conda-forge contextily` "
             "to install the package."
         )
 
diff --git a/pygmt/src/tilemap.py b/pygmt/src/tilemap.py
index ec26b5dae0f..0fc2b19474a 100644
--- a/pygmt/src/tilemap.py
+++ b/pygmt/src/tilemap.py
@@ -115,7 +115,7 @@ def tilemap(
         raise ModuleNotFoundError(
             "Package `rioxarray` is required to be installed to use this function. "
             "Please use `pip install rioxarray` or "
-            "`conda install -c conda-forge rioxarray` "
+            "`mamba install -c conda-forge rioxarray` "
             "to install the package."
         )