diff --git a/fun-gen.c b/fun-gen.c
index af2f1fd..77bad49 100644
--- a/fun-gen.c
+++ b/fun-gen.c
@@ -28,7 +28,7 @@
 #define MAX_DEGREE 1000
 
 struct poly {
-	unsigned int degree;
+	int degree;
 	double *coefs;
 	const char *expr;
 };
@@ -78,7 +78,7 @@ static void
 print_fun_body(size_t n, struct poly *polys)
 {
 	size_t i, j;
-	unsigned int d;
+	int d;
 
 	printf("\tlong double complex a");
 	for (i = 0; i < n; i++)
@@ -177,7 +177,7 @@ static void
 do_poly_div(int argc, char *argv[])
 {
 	struct poly p, q;
-	unsigned int i, j, p_degree, q_degree;
+	int i, j, p_degree, q_degree;
 
 	if (argc < 2)
 		usage();
@@ -208,7 +208,7 @@ static void
 do_newton(int argc, char *argv[])
 {
 	struct poly f, df, p;
-	unsigned int i, j, f_degree;
+	int i, j, f_degree;
 
 	if (argc < 1)
 		usage();
diff --git a/julia.c b/julia.c
index 1e329d1..1d1e521 100644
--- a/julia.c
+++ b/julia.c
@@ -33,7 +33,7 @@ static long double bailout = 1e100,
     epsilon = 1e-8,
     sec_w = 4.0,
     contour = 0.0005L;
-static unsigned long niters = 250;
+static long niters = 250;
 
 static void
 print_critical_points(void)
@@ -73,7 +73,7 @@ iterate(long double complex z, long double complex c, long double *rit)
 {
 	long double complex dz = 1.0L;
 	long double t;
-	unsigned long i;
+	long i;
 
 	for (i = 0; i < niters && cabsl(z) < bailout; i++) {
 		dz = df(z) * dz;
@@ -100,7 +100,7 @@ static long
 fast_iterate(long double complex z, long double complex c, long double *rit)
 {
 	long double t;
-	unsigned long i;
+	long i;
 
 	for (i = 0; i < niters && cabsl(z) < bailout; i++) {
 		z = f(z) + c;
@@ -151,7 +151,7 @@ julia_main(int argc, char *argv[])
 	    zoom = 1.0,
 	    light, light_x, light_y, light_z, rit, sec_h, zx, zy;
 	long long it, idx, ritnum;
-	unsigned int palette_size = 720,
+	int palette_size = 720,
 	    width = 640,
 	    height = 400,
 	    i, j;
@@ -184,7 +184,7 @@ julia_main(int argc, char *argv[])
 			light_intensity = parse_double(optarg);
 			break;
 		case 'n':
-			niters = parse_integer(optarg, 1, ULONG_MAX);
+			niters = parse_integer(optarg, 1, LONG_MAX);
 			break;
 		case 'w':
 			width = parse_integer(optarg, 1, 65536);
diff --git a/palette.c b/palette.c
index d6c1ef8..03ab1b4 100644
--- a/palette.c
+++ b/palette.c
@@ -83,8 +83,7 @@ int
 palette_main(int argc, char *argv[])
 {
 	struct color *palette;
-	unsigned int width, height;
-	int ch, i, j;
+	int ch, i, j, width, height;
 
 	height = 100;
 	width = 720;