diff --git a/src/button/button-xbm.c b/src/button/button-xbm.c
index 0110c3a1..87b888db 100644
--- a/src/button/button-xbm.c
+++ b/src/button/button-xbm.c
@@ -296,7 +296,7 @@ button_xbm_load(const char *button_name, const char *alt_name,
 	}
 
 	if (!pixmap.data) {
-		if (fallback_button[0] == 0xFF) {
+		if (fallback_button[0] == 0x40) {
 			*buffer = NULL;
 			return;
 		}
diff --git a/src/theme.c b/src/theme.c
index 36b944f0..2c3af6bc 100644
--- a/src/theme.c
+++ b/src/theme.c
@@ -122,7 +122,7 @@ load_buttons(struct theme *theme)
 		},
 		{
 			"menu_hover", NULL,
-			{ 0xFF, 0, 0, 0, 0, 0 },
+			{ 0x40, 0, 0, 0, 0, 0 },
 			{
 				&theme->button_menu_active_hover,
 				theme->window_active_button_menu_unpressed_image_color,
@@ -134,7 +134,7 @@ load_buttons(struct theme *theme)
 		},
 		{
 			"iconify_hover", NULL,
-			{ 0xFF, 0, 0, 0, 0, 0 },
+			{ 0x40, 0, 0, 0, 0, 0 },
 			{
 				&theme->button_iconify_active_hover,
 				theme->window_active_button_iconify_unpressed_image_color,
@@ -146,7 +146,7 @@ load_buttons(struct theme *theme)
 		},
 		{
 			"max_hover", NULL,
-			{ 0xFF, 0, 0, 0, 0, 0 },
+			{ 0x40, 0, 0, 0, 0, 0 },
 			{
 				&theme->button_maximize_active_hover,
 				theme->window_active_button_max_unpressed_image_color,
@@ -158,7 +158,7 @@ load_buttons(struct theme *theme)
 		},
 		{
 			"max_hover_toggled", "max_toggled_hover",
-			{ 0xFF, 0, 0, 0, 0, 0 },
+			{ 0x40, 0, 0, 0, 0, 0 },
 			{
 				&theme->button_restore_active_hover,
 				theme->window_active_button_max_unpressed_image_color,
@@ -170,7 +170,7 @@ load_buttons(struct theme *theme)
 		},
 		{
 			"close_hover", NULL,
-			{ 0xFF, 0, 0, 0, 0, 0 },
+			{ 0x40, 0, 0, 0, 0, 0 },
 			{
 				&theme->button_close_active_hover,
 				theme->window_active_button_close_unpressed_image_color,