diff --git a/tests/sanitize_defaults.cfg b/tests/sanitize_defaults.cfg
index ab5ae82..3ab341b 100644
--- a/tests/sanitize_defaults.cfg
+++ b/tests/sanitize_defaults.cfg
@@ -13,4 +13,8 @@ replace: TIMESTAMP
 
 [Memory addresses]
 regex: (<[a-zA-Z_][0-9a-zA-Z_.]* at )(0x[0-9a-fA-F]+)(>)
-replace: \1MEMORY_ADDRESS\3
\ No newline at end of file
+replace: \1MEMORY_ADDRESS\3
+
+[Matplotlib figure size]
+regex: (Figure size )\d+x\d+( with \d+ Axes)
+replace: \1WIDTHxHEIGHT\2