diff --git a/share/msgdef/el_GR.ISO8859-7.src b/share/msgdef/el_GR.ISO8859-7.src
index b5560672adb..85d433e990c 100644
--- a/share/msgdef/el_GR.ISO8859-7.src
+++ b/share/msgdef/el_GR.ISO8859-7.src
@@ -7,4 +7,8 @@
 ^[íÍyY].*
 # noexpr
 ^[ïÏnN].*
+# yesstr
+ÍÁÉ
+# nostr
+Ï×É
 # EOF
diff --git a/share/msgdef/el_GR.ISO_8859-7.src b/share/msgdef/el_GR.ISO_8859-7.src
index b5560672adb..85d433e990c 100644
--- a/share/msgdef/el_GR.ISO_8859-7.src
+++ b/share/msgdef/el_GR.ISO_8859-7.src
@@ -7,4 +7,8 @@
 ^[íÍyY].*
 # noexpr
 ^[ïÏnN].*
+# yesstr
+ÍÁÉ
+# nostr
+Ï×É
 # EOF