diff --git a/src/packages/array_basic.rs b/src/packages/array_basic.rs
index 2b9da1f5..bf06ed47 100644
--- a/src/packages/array_basic.rs
+++ b/src/packages/array_basic.rs
@@ -41,11 +41,13 @@ fn pad<T: Variant + Clone>(engine: &Engine, args: &mut [&mut Dynamic]) -> FuncRe
         }
     }
 
-    if len >= 0 {
+    if len > 0 {
         let item = args[2].clone();
         let list = args[0].downcast_mut::<Array>().unwrap();
 
-        list.resize(len as usize, item);
+        if len as usize > list.len() {
+            list.resize(len as usize, item);
+        }
     }
     Ok(())
 }
diff --git a/src/packages/string_more.rs b/src/packages/string_more.rs
index 2037c215..7bc10012 100644
--- a/src/packages/string_more.rs
+++ b/src/packages/string_more.rs
@@ -242,29 +242,31 @@ def_package!(crate:MoreStringPackage:"Additional string utilities, including str
                 }
             }
 
-            let ch = *args[2].downcast_ref::< char>().unwrap();
-            let s = args[0].downcast_mut::<ImmutableString>().unwrap();
+            if len > 0 {
+                let ch = *args[2].downcast_ref::< char>().unwrap();
+                let s = args[0].downcast_mut::<ImmutableString>().unwrap();
 
-            let orig_len = s.chars().count();
+                let orig_len = s.chars().count();
 
-            if orig_len < len as usize {
-                let p = s.make_mut();
+                if len as usize > orig_len  {
+                    let p = s.make_mut();
 
-                for _ in 0..(len as usize - orig_len) {
-                    p.push(ch);
+                    for _ in 0..(len as usize - orig_len) {
+                        p.push(ch);
+                    }
+
+                    if engine.max_string_size > 0 && s.len() > engine.max_string_size {
+                        return Err(Box::new(EvalAltResult::ErrorDataTooLarge(
+                            "Length of string".to_string(),
+                            engine.max_string_size,
+                            s.len(),
+                            Position::none(),
+                        )));
+                    }
                 }
             }
 
-            if engine.max_string_size > 0 && s.len() > engine.max_string_size {
-                Err(Box::new(EvalAltResult::ErrorDataTooLarge(
-                    "Length of string".to_string(),
-                    engine.max_string_size,
-                    s.len(),
-                    Position::none(),
-                )))
-            } else {
-                Ok(())
-            }
+            Ok(())
         },
     );
     lib.set_fn_3_mut(