diff --git a/base.h b/base.h
index e4a395d..e067300 100644
--- a/base.h
+++ b/base.h
@@ -91,7 +91,7 @@ ORCA_FORCEINLINE static Usz orca_round_up_power2(Usz x) {
 }
 
 ORCA_OK_IF_UNUSED
-static bool is_valid_glyph(Glyph c) {
+static bool orca_is_valid_glyph(Glyph c) {
   if (c >= '0' && c <= '9')
     return true;
   if (c >= 'A' && c <= 'Z')
diff --git a/sysmisc.c b/sysmisc.c
index 512bfa0..d406aee 100644
--- a/sysmisc.c
+++ b/sysmisc.c
@@ -51,7 +51,7 @@ Cboard_error cboard_paste(Glyph *gbuffer, Usz height, Usz width, Usz y, Usz x,
         continue;
       }
       if (c != ' ' && y < height && x < width) {
-        Glyph g = is_valid_glyph((Glyph)c) ? (Glyph)c : '.';
+        Glyph g = orca_is_valid_glyph(c) ? (Glyph)c : '.';
         gbuffer_poke(gbuffer, height, width, y, x, g);
         if (x > max_x)
           max_x = x;
diff --git a/tui_main.c b/tui_main.c
index 71b1810..4df8672 100644
--- a/tui_main.c
+++ b/tui_main.c
@@ -3622,7 +3622,7 @@ event_loop:;
       }
       if (key != ' ') {
         char cleaned = (char)key;
-        if (!is_valid_glyph((Glyph)key))
+        if (!orca_is_valid_glyph((Glyph)key))
           cleaned = '.';
         if (brackpaste_y < t.ged.field.height &&
             brackpaste_x < t.ged.field.width) {
@@ -3870,7 +3870,7 @@ event_loop:;
     break;
 
   default:
-    if (key >= CHAR_MIN && key <= CHAR_MAX && is_valid_glyph((Glyph)key))
+    if (key >= CHAR_MIN && key <= CHAR_MAX && orca_is_valid_glyph((Glyph)key))
       ged_input_character(&t.ged, (char)key);
 #if 0
       else