diff --git a/c-programming/strings/asprintf.c b/c-programming/strings/asprintf.c
index 16059ce..45ed617 100644
--- a/c-programming/strings/asprintf.c
+++ b/c-programming/strings/asprintf.c
@@ -50,13 +50,13 @@ int main(void) {
 	const char* world = " world";
 
 	char* output;
-	size_t result = asprintf(&output, "Hello%s! -- Unsigned 32-bit type is "
+	ssize_t result = asprintf(&output, "Hello%s! -- Unsigned 32-bit type is "
 		"constrained to lie\nwithin the range of integer values from "
 		"%" PRIu32 " to %" PRIu32 " inclusive.", world, 0,
 		(uint32_t) (powf(2.0f, 32.0f) - 1.0f));
 
-	PRINT_ASSERT("segmentation fault", true);
-	PRINT_ASSERT("no errors", errno == 0);
+	PRINT_ASSERT("no segmentation fault", true);
+	PRINT_ASSERT("no errors occurred", result != -1);
 	PRINT_ASSERT("zero termination test", output[result] == '\0');
 
 	printf("[asprintf (%zu)] '%s'\n", result, output);