diff --git a/src/tests.c b/src/tests.c
index 1b9d43e1..8ae9006f 100644
--- a/src/tests.c
+++ b/src/tests.c
@@ -17,6 +17,7 @@ static void _test_nop(const char* exe_path)
 	snprintf(command, sizeof(command), "%s run --ssb-port=0 -s out/test.js", exe_path);
 	printf("%s\n", command);
 	int result = system(command);
+	(void)result;
 	assert(WIFEXITED(result));
 	assert(WEXITSTATUS(result) == 0);
 }
@@ -45,6 +46,7 @@ static void _test_child(const char* exe_path)
 	snprintf(command, sizeof(command), "%s run --ssb-port=0 -s out/test.js", exe_path);
 	printf("%s\n", command);
 	int result = system(command);
+	(void)result;
 	assert(WIFEXITED(result));
 	assert(WEXITSTATUS(result) == 0);
 
@@ -84,6 +86,7 @@ static void _test_promise(const char* exe_path)
 	snprintf(command, sizeof(command), "%s run --ssb-port=0 -s out/test.js", exe_path);
 	printf("%s\n", command);
 	int result = system(command);
+	(void)result;
 	assert(WIFEXITED(result));
 	assert(WEXITSTATUS(result) == 0);
 
@@ -127,6 +130,7 @@ static void _test_promise_remote_throw(const char* exe_path)
 	snprintf(command, sizeof(command), "%s run --ssb-port=0 -s out/test.js", exe_path);
 	printf("%s\n", command);
 	int result = system(command);
+	(void)result;
 	assert(WIFEXITED(result));
 	assert(WEXITSTATUS(result) == 0);
 
@@ -172,6 +176,7 @@ static void _test_promise_remote_reject(const char* exe_path)
 	snprintf(command, sizeof(command), "%s run --ssb-port=0 -s out/test.js", exe_path);
 	printf("%s\n", command);
 	int result = system(command);
+	(void)result;
 	assert(WIFEXITED(result));
 	assert(WEXITSTATUS(result) == 0);