diff --git a/clmm/theory/parent_class.py b/clmm/theory/parent_class.py
index 5dd65b7ab..433c56214 100644
--- a/clmm/theory/parent_class.py
+++ b/clmm/theory/parent_class.py
@@ -778,7 +778,7 @@ def eval_surface_density(self, r_proj, z_cl, r_mis=None, verbose=False, backend=
             validate_argument(locals(), "r_proj", "float_array", argmin=0)
             validate_argument(locals(), "z_cl", float, argmin=0)
             if r_mis is not None:
-                validate_argument(locals(), "r_mis", float, argmin=0)
+                validate_argument(locals(), "r_mis", float, argmin=0, eqmin=True)
 
         if self.halo_profile_model == "einasto" and verbose:
             print(f"Einasto alpha = {self._get_einasto_alpha(z_cl=z_cl)}")
@@ -855,7 +855,7 @@ def eval_excess_surface_density(self, r_proj, z_cl, r_mis=None, verbose=False, b
             validate_argument(locals(), "r_proj", "float_array", argmin=0)
             validate_argument(locals(), "z_cl", float, argmin=0)
             if r_mis is not None:
-                validate_argument(locals(), "r_mis", float, argmin=0)
+                validate_argument(locals(), "r_mis", float, argmin=0, eqmin=True)
 
         if self.halo_profile_model == "einasto" and verbose:
             print(f"Einasto alpha = {self._get_einasto_alpha(z_cl=z_cl)}")