diff --git a/jsbnumber.c b/jsbnumber.c
index d69d310..57afaa8 100644
--- a/jsbnumber.c
+++ b/jsbnumber.c
@@ -37,7 +37,7 @@ static int Np_toFixed(js_State *J, int n)
 	js_Object *self = js_toobject(J, 0);
 	int width = js_tonumber(J, 1);
 	if (self->type != JS_CNUMBER) jsR_error(J, "TypeError");
-	sprintf(buf, "%*f", width, self->u.number);
+	sprintf(buf, "%.*f", width, self->u.number);
 	js_pushstring(J, buf);
 	return 1;
 }
@@ -48,7 +48,7 @@ static int Np_toExponential(js_State *J, int n)
 	js_Object *self = js_toobject(J, 0);
 	int width = js_tonumber(J, 1);
 	if (self->type != JS_CNUMBER) jsR_error(J, "TypeError");
-	sprintf(buf, "%*e", width, self->u.number);
+	sprintf(buf, "%.*e", width, self->u.number);
 	js_pushstring(J, buf);
 	return 1;
 }
@@ -59,7 +59,7 @@ static int Np_toPrecision(js_State *J, int n)
 	js_Object *self = js_toobject(J, 0);
 	int width = js_tonumber(J, 1);
 	if (self->type != JS_CNUMBER) jsR_error(J, "TypeError");
-	sprintf(buf, "%*g", width, self->u.number);
+	sprintf(buf, "%.*g", width, self->u.number);
 	js_pushstring(J, buf);
 	return 1;
 }