Index: src/os_win.c
==================================================================
--- src/os_win.c
+++ src/os_win.c
@@ -1349,15 +1349,22 @@
     case SQLITE_FCNTL_CHUNK_SIZE: {
       pFile->szChunk = *(int *)pArg;
       return SQLITE_OK;
     }
     case SQLITE_FCNTL_SIZE_HINT: {
-      sqlite3_int64 sz = *(sqlite3_int64*)pArg;
-      SimulateIOErrorBenign(1);
-      winTruncate(id, sz);
-      SimulateIOErrorBenign(0);
-      return SQLITE_OK;
+      winFile *pFile = (winFile*)id;
+      sqlite3_int64 oldSz;
+      int rc = winFileSize(id, &oldSz);
+      if( rc==SQLITE_OK ){
+        sqlite3_int64 newSz = *(sqlite3_int64*)pArg;
+        if( newSz>oldSz ){
+          SimulateIOErrorBenign(1);
+          rc = winTruncate(id, newSz);
+          SimulateIOErrorBenign(0);
+        }
+      }
+      return rc;
     }
     case SQLITE_FCNTL_PERSIST_WAL: {
       int bPersist = *(int*)pArg;
       if( bPersist<0 ){
         *(int*)pArg = pFile->bPersistWal;

Index: test/pager1.test
==================================================================
--- test/pager1.test
+++ test/pager1.test
@@ -2416,7 +2416,44 @@
   sqlite3 db2 test.db2
   execsql { PRAGMA integrity_check } db2
 } {ok}
 }
 
+#-------------------------------------------------------------------------
+# Test that a database file can be "pre-hinted" to a certain size and that
+# subsequent spilling of the pager cache does not result in the database
+# file being shrunk.
+#
+catch {db close}
+forcedelete test.db
+
+do_test pager1-32.1 {
+  sqlite3 db test.db
+  execsql {
+    CREATE TABLE t1(x, y);
+  }
+  db close
+  sqlite3 db test.db
+  execsql {
+    BEGIN;
+    INSERT INTO t1 VALUES(1, randomblob(10000));
+  }
+  file_control_sizehint_test db main 20971520; # 20MB
+  execsql {
+    PRAGMA cache_size = 10;
+    INSERT INTO t1 VALUES(1, randomblob(10000));
+    INSERT INTO t1 VALUES(2, randomblob(10000));
+    INSERT INTO t1 SELECT x+2, randomblob(10000) from t1;
+    INSERT INTO t1 SELECT x+4, randomblob(10000) from t1;
+    INSERT INTO t1 SELECT x+8, randomblob(10000) from t1;
+    INSERT INTO t1 SELECT x+16, randomblob(10000) from t1;
+    SELECT count(*) FROM t1;
+    COMMIT;
+  }
+  db close
+  file size test.db
+} {20971520}
+
+# Cleanup 20MB file left by the previous test.
+forcedelete test.db
 
 finish_test