diff --git a/source/blender/makesrna/intern/rna_modifier.cc b/source/blender/makesrna/intern/rna_modifier.cc
index 6fc037151a5..6e9ab9df582 100644
--- a/source/blender/makesrna/intern/rna_modifier.cc
+++ b/source/blender/makesrna/intern/rna_modifier.cc
@@ -3281,8 +3281,9 @@ static void rna_def_modifier_smooth(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Factor", "Strength of modifier effect");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");
 
-  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_NONE);
+  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_UNSIGNED);
   RNA_def_property_int_sdna(prop, nullptr, "repeat");
+  RNA_def_property_range(prop, 0, SHRT_MAX);
   RNA_def_property_ui_range(prop, 0, 30, 1, -1);
   RNA_def_property_ui_text(prop, "Repeat", "");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");
@@ -3352,8 +3353,9 @@ static void rna_def_modifier_correctivesmooth(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Lambda Factor", "Smooth effect factor");
   RNA_def_property_update(prop, 0, "rna_CorrectiveSmoothModifier_update");
 
-  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_NONE);
+  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_UNSIGNED);
   RNA_def_property_int_sdna(prop, nullptr, "repeat");
+  RNA_def_property_range(prop, 0, SHRT_MAX);
   RNA_def_property_ui_range(prop, 0, 200, 1, -1);
   RNA_def_property_ui_text(prop, "Repeat", "");
   RNA_def_property_update(prop, 0, "rna_CorrectiveSmoothModifier_update");
@@ -3464,8 +3466,9 @@ static void rna_def_modifier_laplaciansmooth(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Lambda Border", "Lambda factor in border");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");
 
-  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_NONE);
+  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_UNSIGNED);
   RNA_def_property_int_sdna(prop, nullptr, "repeat");
+  RNA_def_property_range(prop, 0, SHRT_MAX);
   RNA_def_property_ui_range(prop, 0, 200, 1, -1);
   RNA_def_property_ui_text(prop, "Repeat", "");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");
@@ -6240,8 +6243,9 @@ static void rna_def_modifier_laplaciandeform(BlenderRNA *brna)
   RNA_def_property_string_funcs(
       prop, nullptr, nullptr, "rna_LaplacianDeformModifier_anchor_grp_name_set");
 
-  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_NONE);
+  prop = RNA_def_property(srna, "iterations", PROP_INT, PROP_UNSIGNED);
   RNA_def_property_int_sdna(prop, nullptr, "repeat");
+  RNA_def_property_range(prop, 0, SHRT_MAX);
   RNA_def_property_ui_range(prop, 1, 50, 1, -1);
   RNA_def_property_ui_text(prop, "Repeat", "");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");