diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index 9b4012f2d..14863b205 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -14,7 +14,7 @@
 
 /* Minimum free space (in bytes) needed for data directory */
 static const uint64_t GB_BYTES = 1000000000LL;
-static const uint64_t BLOCK_CHAIN_SIZE = 20LL * GB_BYTES;
+static const uint64_t BLOCK_CHAIN_SIZE = 5LL * GB_BYTES;
 
 /* Check free space asynchronously to prevent hanging the UI thread.