diff --git a/example.c b/example.c
index 68fb873..0955be3 100644
--- a/example.c
+++ b/example.c
@@ -12,7 +12,7 @@
 
 #include "minmea.h"
 
-int main()
+int main(void)
 {
     char line[MINMEA_MAX_LENGTH];
     while (fgets(line, sizeof(line), stdin) != NULL) {
diff --git a/tests.c b/tests.c
index e5fd45b..a503c3c 100644
--- a/tests.c
+++ b/tests.c
@@ -754,7 +754,7 @@ Suite *minmea_suite(void)
     return s;
 }
 
-int main()
+int main(void)
 {
     int number_failed;
     Suite *s = minmea_suite();