diff --git a/file1.shapes.ttl b/file1.shapes.ttl
index 5f9a5f8..30cbe4b 100644
--- a/file1.shapes.ttl
+++ b/file1.shapes.ttl
@@ -2,6 +2,7 @@
 # imports: http://datashapes.org/dash
 # prefix: file1
 
+@base <https://example/file1> .
 @prefix dash: <http://datashapes.org/dash#> .
 @prefix file1: <https://example/file1#> .
 @prefix owl: <http://www.w3.org/2002/07/owl#> .
diff --git a/subfolder/file2.shapes.ttl b/subfolder/file2.shapes.ttl
index 917c8c1..6690837 100644
--- a/subfolder/file2.shapes.ttl
+++ b/subfolder/file2.shapes.ttl
@@ -3,6 +3,7 @@
 # imports: https://example/file1
 # prefix: file2
 
+@base <https://example/file2> .
 @prefix dash: <http://datashapes.org/dash#> .
 @prefix file1: <https://example/file1#> .
 @prefix file2: <https://example/file2#> .