diff --git a/test/test.c b/test/test.c
index d8acd3b..5cb08aa 100644
--- a/test/test.c
+++ b/test/test.c
@@ -59,17 +59,17 @@ int main(int argc, char **argv) {
 
 	test_case = malloc(sizeof(int) * n);
 	if (test_case == NULL) {
-		fprintf("Error: Out of heap space!\n");
+		fprintf(stderr, "Error: Out of heap space!\n");
 		exit(1);
 	}
 	qarray = malloc(sizeof(int) * n);
 	if (qarray == NULL) {
-		fprintf("Error: Out of heap space!\n");
+		fprintf(stderr, "Error: Out of heap space!\n");
 		exit(1);
 	}
 	test_array = malloc(sizeof(int) * n);
 	if (test_array == NULL) {
-		fprintf("Error: Out of heap space!\n");
+		fprintf(stderr, "Error: Out of heap space!\n");
 		exit(1);
 	}