diff --git a/src/platform/3ds/gui-font.c b/src/platform/3ds/gui-font.c
index 8ae3fb11e..783092574 100644
--- a/src/platform/3ds/gui-font.c
+++ b/src/platform/3ds/gui-font.c
@@ -60,7 +60,7 @@ void GUIFontDrawGlyph(const struct GUIFont* font, int glyph_x, int glyph_y, uint
 	ctrActivateTexture(&font->texture);
 
 	if (glyph > 0x7F) {
-		glyph = 0;
+		glyph = '?';
 	}
 
 	struct GUIFontGlyphMetric metric = defaultFontMetrics[glyph];
diff --git a/src/platform/psp2/gui-font.c b/src/platform/psp2/gui-font.c
index 9e526c129..92145d548 100644
--- a/src/platform/psp2/gui-font.c
+++ b/src/platform/psp2/gui-font.c
@@ -40,14 +40,14 @@ unsigned GUIFontHeight(const struct GUIFont* font) {
 unsigned GUIFontGlyphWidth(const struct GUIFont* font, uint32_t glyph) {
 	UNUSED(font);
 	if (glyph > 0x7F) {
-		glyph = 0;
+		glyph = '?';
 	}
 	return defaultFontMetrics[glyph].width * 2;
 }
 
 void GUIFontDrawGlyph(const struct GUIFont* font, int x, int y, uint32_t color, uint32_t glyph) {
 	if (glyph > 0x7F) {
-		glyph = 0;
+		glyph = '?';
 	}
 	struct GUIFontGlyphMetric metric = defaultFontMetrics[glyph];
 	vita2d_draw_texture_tint_part_scale(font->tex, x, y + (-GLYPH_HEIGHT + metric.padding.top) * 2,
diff --git a/src/platform/wii/gui-font.c b/src/platform/wii/gui-font.c
index f48cfed58..65b672b13 100644
--- a/src/platform/wii/gui-font.c
+++ b/src/platform/wii/gui-font.c
@@ -48,7 +48,7 @@ unsigned GUIFontHeight(const struct GUIFont* font) {
 unsigned GUIFontGlyphWidth(const struct GUIFont* font, uint32_t glyph) {
 	UNUSED(font);
 	if (glyph > 0x7F) {
-		glyph = 0;
+		glyph = '?';
 	}
 	return defaultFontMetrics[glyph].width;
 }
@@ -66,7 +66,7 @@ void GUIFontDrawGlyph(const struct GUIFont* font, int x, int y, uint32_t color,
 	GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_CLR0, GX_CLR_RGBA, GX_RGBA8, 0);
 
 	if (glyph > 0x7F) {
-		glyph = 0;
+		glyph = '?';
 	}
 	struct GUIFontGlyphMetric metric = defaultFontMetrics[glyph];
 	s16 tx = (glyph & 15) * CELL_WIDTH + metric.padding.left;