diff --git a/tests/array.c b/tests/array.c
index 69bcb7d..a2e6529 100644
--- a/tests/array.c
+++ b/tests/array.c
@@ -74,7 +74,7 @@ static void _test_foreach(void * value, void * data)
 
 
 /* main */
-int main(int argc, char * argv[])
+int main(void)
 {
 	int ret;
 	Array * array;
diff --git a/tests/config.c b/tests/config.c
index 1ed5052..8e01c93 100644
--- a/tests/config.c
+++ b/tests/config.c
@@ -150,6 +150,7 @@ int main(int argc, char * argv[])
 	int ret = 0;
 	String const variable[] = "variable";
 	String const expected[] = "expected";
+	(void) argc;
 
 	ret |= _test(argv[0], "config.conf", variable, expected);
 	ret |= _test(argv[0], "config-noeol.conf", variable, expected);
diff --git a/tests/event.c b/tests/event.c
index 03d972d..19d974f 100644
--- a/tests/event.c
+++ b/tests/event.c
@@ -49,5 +49,7 @@ static int _event_on_idle(void * data)
 /* main */
 int main(int argc, char * argv[])
 {
+	(void) argc;
+
 	return (_event(argv[0]) == 0) ? 0 : 2;
 }
diff --git a/tests/string.c b/tests/string.c
index 8de2e56..f4df802 100644
--- a/tests/string.c
+++ b/tests/string.c
@@ -115,6 +115,7 @@ int main(int argc, char * argv[])
 {
 	int ret = 0;
 	String * s;
+	(void) argc;
 
 	/* test */
 	if((s = string_new(argv[0])) == NULL)
diff --git a/tests/variable.c b/tests/variable.c
index 0d9499a..803d820 100644
--- a/tests/variable.c
+++ b/tests/variable.c
@@ -63,5 +63,7 @@ static int _variable(char const * progname)
 /* main */
 int main(int argc, char * argv[])
 {
+	(void) argc;
+
 	return (_variable(argv[0]) == 0) ? 0 : 2;
 }