diff --git a/masque/file/svg.py b/masque/file/svg.py
index 09e3056..8c4b43d 100644
--- a/masque/file/svg.py
+++ b/masque/file/svg.py
@@ -50,7 +50,7 @@ def writefile(
     bounds = pattern.get_bounds(library=library)
     if bounds is None:
         bounds_min, bounds_max = numpy.array([[-1, -1], [1, 1]])
-        warnings.warn('Pattern had no bounds (empty?); setting arbitrary viewbox')
+        warnings.warn('Pattern had no bounds (empty?); setting arbitrary viewbox', stacklevel=1)
     else:
         bounds_min, bounds_max = bounds
 
@@ -117,7 +117,7 @@ def writefile_inverted(
     bounds = pattern.get_bounds(library=library)
     if bounds is None:
         bounds_min, bounds_max = numpy.array([[-1, -1], [1, 1]])
-        warnings.warn('Pattern had no bounds (empty?); setting arbitrary viewbox')
+        warnings.warn('Pattern had no bounds (empty?); setting arbitrary viewbox', stacklevel=1)
     else:
         bounds_min, bounds_max = bounds