diff --git a/AvailableColumnsPanel.c b/AvailableColumnsPanel.c
index feea5786..8945bd2c 100644
--- a/AvailableColumnsPanel.c
+++ b/AvailableColumnsPanel.c
@@ -53,7 +53,7 @@ static HandlerResult AvailableColumnsPanel_eventHandler(Panel* super, int ch) {
       }
       default:
       {
-         if (0 < ch && ch < 255 && isalpha((unsigned char)ch))
+         if (0 < ch && ch < 255 && isgraph((unsigned char)ch))
             result = Panel_selectByTyping(super, ch);
          break;
       }
diff --git a/CategoriesPanel.c b/CategoriesPanel.c
index 2dc1c3bf..4ee1ad46 100644
--- a/CategoriesPanel.c
+++ b/CategoriesPanel.c
@@ -87,7 +87,7 @@ static HandlerResult CategoriesPanel_eventHandler(Panel* super, int ch) {
          break;
       }
       default:
-         if (0 < ch && ch < 255 && isalpha((unsigned char)ch))
+         if (0 < ch && ch < 255 && isgraph((unsigned char)ch))
             result = Panel_selectByTyping(super, ch);
          if (result == BREAK_LOOP)
             result = IGNORED;
diff --git a/ColumnsPanel.c b/ColumnsPanel.c
index 63348ec5..b2a82465 100644
--- a/ColumnsPanel.c
+++ b/ColumnsPanel.c
@@ -95,7 +95,7 @@ static HandlerResult ColumnsPanel_eventHandler(Panel* super, int ch) {
       }
       default:
       {
-         if (0 < ch && ch < 255 && isalpha((unsigned char)ch))
+         if (0 < ch && ch < 255 && isgraph((unsigned char)ch))
             result = Panel_selectByTyping(super, ch);
          if (result == BREAK_LOOP)
             result = IGNORED;
diff --git a/Panel.c b/Panel.c
index 232477b7..21dfbe22 100644
--- a/Panel.c
+++ b/Panel.c
@@ -430,7 +430,7 @@ HandlerResult Panel_selectByTyping(Panel* this, int ch) {
       this->eventHandlerState = xCalloc(100, sizeof(char));
    char* buffer = this->eventHandlerState;
 
-   if (0 < ch && ch < 255 && isalnum((unsigned char)ch)) {
+   if (0 < ch && ch < 255 && isgraph((unsigned char)ch)) {
       int len = strlen(buffer);
       if (!len) {
          if ('/' == ch) {