diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -287,6 +287,12 @@
         if (bytesAvailable < requiredSpace * GB_BYTES) {
             freeString += " " + tr("(of %n GB needed)", "", requiredSpace);
             ui->freeSpace->setStyleSheet("QLabel { color: #800000 }");
+            ui->prune->setChecked(true);
+        } else if (bytesAvailable / GB_BYTES - requiredSpace < 10) {
+            freeString +=
+                " " + tr("(%n GB needed for full chain)", "", requiredSpace);
+            ui->freeSpace->setStyleSheet("QLabel { color: #999900 }");
+            ui->prune->setChecked(true);
         } else {
             ui->freeSpace->setStyleSheet("");
         }