diff --git a/share/numericdef/el_GR.ISO8859-7.src b/share/numericdef/el_GR.ISO8859-7.src
index ee9ee5b4d15e..20911c971968 100644
--- a/share/numericdef/el_GR.ISO8859-7.src
+++ b/share/numericdef/el_GR.ISO8859-7.src
@@ -8,5 +8,5 @@
 # thousands_sep
 .
 # grouping
--1
+3;3
 # EOF