diff --git a/map2loop/m2l_map_checker.py b/map2loop/m2l_map_checker.py
index af7a51a..0c8138a 100644
--- a/map2loop/m2l_map_checker.py
+++ b/map2loop/m2l_map_checker.py
@@ -449,9 +449,9 @@ def check_geology_map(
             geology[c_l["o"]] = geology.index
         # Check if some id values are blank and set appropriately
         elif len(geology[~geology[c_l["o"]].isnull()]) != len(geology):
-            vals = geology[geology[c_l["o"]].astype(str).str.isnumeric()][
-                c_l["o"]
-            ].astype(int)
+            vals = geology[
+                geology[c_l["o"]].astype(str).str.replace(".", "", 1).str.isdigit()
+            ][c_l["o"]].astype(int)
             next_index = int(np.nanmax(vals)) + 1
             for ind, layer in geology.iterrows():
                 if pd.isna(layer[c_l["o"]]):