diff --git a/main.c b/main.c
index b8711e4..d48ba04 100644
--- a/main.c
+++ b/main.c
@@ -18,8 +18,8 @@ void print_version(void);
 void print_usage(void);
 
 int main(const int argc, const char *const *const argv) {
-    price_t price;
-    wattage_t wattage;
+    price_t price = 0;
+    wattage_t wattage = 0;
     interval_t interval = 0;
 
     switch (parse_arguments(argc, argv, &price, &wattage, &interval)) {