diff --git a/pyam/plotting.py b/pyam/plotting.py
index b5f739d4f..c7289f8c8 100644
--- a/pyam/plotting.py
+++ b/pyam/plotting.py
@@ -227,7 +227,7 @@ def assign_style_props(df, color=None, marker=None, linestyle=None, cmap=None):
         values = list(d.values())
         # find if any colors in our properties corresponds with special colors
         # we know about
-        overlap_idx = np.in1d(values, list(PYAM_COLORS.keys()))
+        overlap_idx = np.isin(values, list(PYAM_COLORS.keys()))
         if overlap_idx.any():  # some exist in our special set
             keys = np.array(list(d.keys()))[overlap_idx]
             values = np.array(values)[overlap_idx]
diff --git a/pyam/timeseries.py b/pyam/timeseries.py
index c499b6003..70a7939d3 100644
--- a/pyam/timeseries.py
+++ b/pyam/timeseries.py
@@ -130,7 +130,7 @@ def cross_threshold(
 
     # it year (as int) is returned, add one because int() rounds down
     if return_type is int:
-        return [y + 1 for y in map(int, years)]
+        return [y + 1 for y in map(int, years.ravel())]
     return years