diff --git a/tests/playground/report.py b/tests/playground/report.py
index f37e37eb3c..4ad6da830e 100755
--- a/tests/playground/report.py
+++ b/tests/playground/report.py
@@ -24,7 +24,7 @@ def pp(bench, cat, prop):
 CATBAG = {
     '.lean': ("Lean [s]", "etime"),
     '.gcc.lean': ("Lean+GCC9", "etime"),
-    '.gc.lean': ("GC [%]", "gc"),
+    '.gc.lean': ("del [%]", "gc"),
     '.lean.perf': ("cache misses [1M/s]", "cache-misses"),
     '.hs': ("GHC", "etime"),
     '.gc.hs': ("GC [%]", "gc"),