diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index f5023bf84..05783ac2f 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -22,7 +22,7 @@
 
 static const uint64_t GB_BYTES = 1000000000LL;
 /* Minimum free space (in GB) needed for data directory */
-static const uint64_t BLOCK_CHAIN_SIZE = 14;
+static const uint64_t BLOCK_CHAIN_SIZE = 18;
 /* Minimum free space (in GB) needed for data directory when pruned; Does not include prune target */
 static const uint64_t CHAIN_STATE_SIZE = 3;
 /* Total required space (in GB) depending on user choice (prune, not prune) */