diff --git a/source/main.c b/source/main.c
index c61b3d2..bf1e043 100644
--- a/source/main.c
+++ b/source/main.c
@@ -43,8 +43,8 @@ get_stdin(void)
 	size_t buffer_size = 0;
 	char * buffer = malloc(ALLOCATION_CHUNK);
 	do {
-		if (!((buffer_size + 1) | ALLOCATION_CHUNK)) {
-			buffer = realloc(buffer, (((buffer_size + 1) & ALLOCATION_CHUNK) + 1) * ALLOCATION_CHUNK);
+		if (!((buffer_size + 1) % ALLOCATION_CHUNK)) {
+			buffer = realloc(buffer, (((buffer_size + 1) / ALLOCATION_CHUNK) + 1) * ALLOCATION_CHUNK);
 		}
 		buffer[buffer_size] = '\0';
 		if (read(STDIN_FILENO, &buffer[buffer_size], sizeof (*buffer)) == -1)