diff --git a/src/main.h b/src/main.h
index 76dc4f8..3c4a44c 100644
--- a/src/main.h
+++ b/src/main.h
@@ -7,21 +7,12 @@ typedef long double   price_t;
 typedef long double   wattage_t;
 typedef unsigned long interval_t;
 
-typedef struct {
-    price_t    price;
-    wattage_t  wattage;
-    interval_t interval;
-} arguments_t;
+int parse_arguments(int argc, char **argv, price_t *price, wattage_t *wattage, interval_t *interval);
 
-arguments_t *parse_arguments(int argc, char **argv);
-
-
-interval_t to_seconds(char *interval);
-inline price_t to_wattpersecond(price_t price);
-
-
-void print_version();
-void print_usage();
+inline interval_t interval_to_seconds(char *interval);
+inline price_t    to_wattspersecond(price_t price);
 
+inline void print_version();
+inline void print_usage();
 
 #endif