diff --git a/src/msspec/parameters.py b/src/msspec/parameters.py
index e2348a2..eaeb91e 100644
--- a/src/msspec/parameters.py
+++ b/src/msspec/parameters.py
@@ -1516,13 +1516,13 @@ class CalculationParameters(BaseParameters):
                 self.spec_parameters.calc_iren = 1
             elif p.value.lower() == 'G_n'.lower():
                 self.spec_parameters.calc_iren = 2
-            LOGGER.info(f"Renormalization activated with \'{p.value}\' method")
+            LOGGER.info("Renormalization activated with \'{}\' method".format(p.value))
 
     def bind_renormalization_omega(self, p):
         omega = complex(p.value)
         self.spec_parameters.calc_renr = omega.real
         self.spec_parameters.calc_reni = omega.imag
-        LOGGER.info(f"Renormalization omega set to \'{p.value}\'")
+        LOGGER.info("Renormalization omega set to \'{}\'".format(p.value))
         
     def bind_RA_cutoff_damping(self, p):
         self.spec_parameters.calc_ino = p.value
@@ -1555,9 +1555,9 @@ class CalculationParameters(BaseParameters):
         LOGGER.info('Radial integrals taken into account: %s', p.value)
         if self.global_parameters.spinpol is False:
             LOGGER.warning(
-               f"'{p.name}' is ignored since the 'spinpol' global parameter is set "
+                "'{}' is ignored since the 'spinpol' global parameter is set "
                 "to False. Enable spin polarization in the constructor of "
-                "your Calculator if you want to use this option.")
+                "your Calculator if you want to use this option.".format(p.name))
 
     def bind_path_filtering(self, p):
         ifwd = ipw = ilength = 0