diff --git a/Makefile b/Makefile
index 949dd1e..7d37246 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ VERSION = 0.0
 PREFIX = /usr/local
 MANPREFIX = $(PREFIX)/share/man
 
-CFLAGS = `pkg-config --cflags gtk4` -std=c99 -Wall -Wextra -g -O0 # -pedantic
+CFLAGS = `pkg-config --cflags gtk4` -std=c99 -Wall -Wextra -g -O0
 LDFLAGS = `pkg-config --libs gtk4` -lm -lpthread
 
 CC = gcc
diff --git a/visor.c b/visor.c
index 19d5645..b882987 100644
--- a/visor.c
+++ b/visor.c
@@ -70,7 +70,6 @@ void color_lookup(int *r, int *g, int *b, double mu);
 void *writer_thread(void *arg)
 {
 	struct threadInfo *info = arg;
-	int32_t index = info->index;
 	while (true) {
 		pthread_mutex_lock(&pixmapMutex);
 		while (!pixmapAvailable || info->complete) {
@@ -327,6 +326,10 @@ static void app_activate(GApplication *app)
 
 void draw_plane(GtkDrawingArea *da, cairo_t *cr, int width, int height, gpointer data)
 {
+	(void) da;
+	(void) width;
+	(void) height;
+	(void) data;
 	cairo_set_source_surface(cr, surface, 0, 0);
 	cairo_paint(cr);
 }