diff --git a/perlmod/src/array.rs b/perlmod/src/array.rs
index ce6e112..895fcdf 100644
--- a/perlmod/src/array.rs
+++ b/perlmod/src/array.rs
@@ -102,6 +102,9 @@ impl Array {
 
     /// Pre-extend the array to up to the specified length..
     pub fn reserve(&self, more: usize) {
+        if more == 0 {
+            return;
+        }
         let idx = self.len() + more - 1;
         unsafe {
             ffi::RSPL_av_extend(self.av(), idx as libc::ssize_t);