diff --git a/src/calc.c b/src/calc.c
index 952def2..0ab05b7 100644
--- a/src/calc.c
+++ b/src/calc.c
@@ -539,9 +539,10 @@ static void process_cb(GObject* source_object, GAsyncResult* res, gpointer user_
         error = NULL;
     }
 
+    gsize bytes_read = 0;
     unsigned int stdout_bufsize = 4096;
     char stdout_buf[stdout_bufsize];
-    g_input_stream_read_all(stdout_stream, stdout_buf, stdout_bufsize, NULL, NULL, &error);
+    g_input_stream_read_all(stdout_stream, stdout_buf, stdout_bufsize, &bytes_read, NULL, &error);
 
     if (error != NULL) {
         g_error("Process errored with: %s", error->message);
@@ -549,8 +550,7 @@ static void process_cb(GObject* source_object, GAsyncResult* res, gpointer user_
         error = NULL;
     }
 
-    unsigned int line_length = strcspn(stdout_buf, "\n");
-    *last_result = g_strndup(stdout_buf, line_length);
+    *last_result = g_strndup(stdout_buf, bytes_read - 1);
     g_input_stream_close(stdout_stream, NULL, &error);
 
     if (error != NULL) {