diff --git a/lib/puppet/pops/time/timespan.rb b/lib/puppet/pops/time/timespan.rb
index 0a65fee3cf9..3ab6a3899a1 100644
--- a/lib/puppet/pops/time/timespan.rb
+++ b/lib/puppet/pops/time/timespan.rb
@@ -633,7 +633,7 @@ def internal_parse(str)
         position = -1
         fstart = 0
 
-        str.codepoints do |codepoint|
+        str.each_codepoint do |codepoint|
           position += 1
           if state == STATE_LITERAL
             if codepoint == 0x25 # '%'