diff --git a/sumo/plotting/__init__.py b/sumo/plotting/__init__.py
index 1a1e27b4..2e9aab9f 100644
--- a/sumo/plotting/__init__.py
+++ b/sumo/plotting/__init__.py
@@ -169,7 +169,7 @@ def power_tick(val, pos, times_sign=r"\times"):
     coeff = val / 10**exponent
     prec = 0 if coeff % 1 == 0 else 1
 
-    return rf"$\mathregular{{{coeff:.{prec}f} {times_sign} 10^{exponent:2d}}}$"
+    return rf"${coeff:.{prec}f}\mathrm{{{times_sign}}}10^{{{exponent:2d}}}$"
 
 
 def colorline(
diff --git a/sumo/plotting/optics_plotter.py b/sumo/plotting/optics_plotter.py
index 03096334..5e4d3ac0 100644
--- a/sumo/plotting/optics_plotter.py
+++ b/sumo/plotting/optics_plotter.py
@@ -243,12 +243,8 @@ def get_plot(
 
             if spectrum_key == "absorption":
                 font = findfont(FontProperties(family=["sans-serif"]))
-                if "Whitney" in font:
-                    times_sign = "x"
-                else:
-                    times_sign = r"\times"
                 ax.yaxis.set_major_formatter(
-                    FuncFormatter(curry_power_tick(times_sign=times_sign))
+                    FuncFormatter(curry_power_tick(times_sign=r"\times"))
                 )
 
             ax.yaxis.set_major_locator(MaxNLocator(5))