diff --git a/Makefile b/Makefile
index 81872d39..451d30d2 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ bench-fib:
 	hyperfine \
 		'./_build/default/benchs/fib_rec.exe -psize=1 -n $(N)' \
 		'./_build/default/benchs/fib_rec.exe -psize=8 -n $(N)' \
-		'./_build/default/benchs/fib_rec.exe -psize=16 -n $(N)' \
+		'./_build/default/benchs/fib_rec.exe -psize=20 -n $(N)' \
 		'./_build/default/benchs/fib_rec.exe -n $(N) -seq'
 
 .PHONY: test clean