diff --git a/fuzzers/016-clb-noutmux/Makefile b/fuzzers/016-clb-noutmux/Makefile
index bf122110..c5cce725 100644
--- a/fuzzers/016-clb-noutmux/Makefile
+++ b/fuzzers/016-clb-noutmux/Makefile
@@ -1,5 +1,5 @@
 # Specimen count
-N := 4
+N := 5
 
 # A grep regex for SLICEM features to be skipped for SLICELs
 SLICEM_FEATURES ?= "DOUTMUX.MC31"
diff --git a/fuzzers/016-clb-noutmux/top.py b/fuzzers/016-clb-noutmux/top.py
index 3c81c38e..916efc8a 100644
--- a/fuzzers/016-clb-noutmux/top.py
+++ b/fuzzers/016-clb-noutmux/top.py
@@ -6,7 +6,7 @@ from prjxray import verilog
 # INCREMENT is the amount of additional CLBN to be instantiated in the design.
 # This makes the fuzzer compilation more robust against failures.
 INCREMENT = os.getenv('CLBN', 0)
-CLBN = 400 + int(INCREMENT)
+CLBN = 600 + int(INCREMENT)
 print('//Requested CLBs: %s' % str(CLBN))
 
 def gen_slicels():