diff --git a/contrib/src/stc/stc.cpp b/contrib/src/stc/stc.cpp
index f534906177..ec1f9949d0 100644
--- a/contrib/src/stc/stc.cpp
+++ b/contrib/src/stc/stc.cpp
@@ -2782,9 +2782,9 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
         // be a function key or etc., the platforms appear to always give us a
         // small value in this case) then fallback to the ascii key code but
         // don't do anything for function keys or etc.
-        if (key <= 255) {
+        if (key <= 127) {
             key = evt.GetKeyCode();
-            keyOk = (key <= 255);
+            keyOk = (key <= 127);
         }
         if (keyOk) {
             m_swx->DoAddChar(key);
diff --git a/contrib/src/stc/stc.cpp.in b/contrib/src/stc/stc.cpp.in
index 9d5b1f19b2..a21f681252 100644
--- a/contrib/src/stc/stc.cpp.in
+++ b/contrib/src/stc/stc.cpp.in
@@ -550,9 +550,9 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
         // be a function key or etc., the platforms appear to always give us a
         // small value in this case) then fallback to the ascii key code but
         // don't do anything for function keys or etc.
-        if (key <= 255) {
+        if (key <= 127) {
             key = evt.GetKeyCode();
-            keyOk = (key <= 255);
+            keyOk = (key <= 127);
         }
         if (keyOk) {
             m_swx->DoAddChar(key);
diff --git a/src/stc/stc.cpp b/src/stc/stc.cpp
index f534906177..ec1f9949d0 100644
--- a/src/stc/stc.cpp
+++ b/src/stc/stc.cpp
@@ -2782,9 +2782,9 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
         // be a function key or etc., the platforms appear to always give us a
         // small value in this case) then fallback to the ascii key code but
         // don't do anything for function keys or etc.
-        if (key <= 255) {
+        if (key <= 127) {
             key = evt.GetKeyCode();
-            keyOk = (key <= 255);
+            keyOk = (key <= 127);
         }
         if (keyOk) {
             m_swx->DoAddChar(key);
diff --git a/src/stc/stc.cpp.in b/src/stc/stc.cpp.in
index 9d5b1f19b2..a21f681252 100644
--- a/src/stc/stc.cpp.in
+++ b/src/stc/stc.cpp.in
@@ -550,9 +550,9 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
         // be a function key or etc., the platforms appear to always give us a
         // small value in this case) then fallback to the ascii key code but
         // don't do anything for function keys or etc.
-        if (key <= 255) {
+        if (key <= 127) {
             key = evt.GetKeyCode();
-            keyOk = (key <= 255);
+            keyOk = (key <= 127);
         }
         if (keyOk) {
             m_swx->DoAddChar(key);