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-rw-r--r--testsuite/driver/testglobals.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/testsuite/driver/testglobals.py b/testsuite/driver/testglobals.py
index ceee5df9a8..e20a8329d7 100644
--- a/testsuite/driver/testglobals.py
+++ b/testsuite/driver/testglobals.py
@@ -43,7 +43,7 @@ class TestConfig:
self.summary_file = ''
# Path to Ghostscript
- self.gs = ''
+ self.gs = None # type: Optional[Path]
# Run tests requiring Haddock
self.haddock = False