diff --git a/fuzzers/005-tilegrid/hclk_cmt/Makefile b/fuzzers/005-tilegrid/hclk_cmt/Makefile
index 8aa2699d..dd7543db 100644
--- a/fuzzers/005-tilegrid/hclk_cmt/Makefile
+++ b/fuzzers/005-tilegrid/hclk_cmt/Makefile
@@ -1,4 +1,4 @@
-N ?= 10
+N ?= 6
 GENERATE_ARGS?="--oneval 1 --design params.csv --dword 5 --dframe 1C"
 include ../fuzzaddr/common.mk
 
diff --git a/fuzzers/005-tilegrid/hclk_ioi/Makefile b/fuzzers/005-tilegrid/hclk_ioi/Makefile
index 3f9f5e2a..d0a1ce10 100644
--- a/fuzzers/005-tilegrid/hclk_ioi/Makefile
+++ b/fuzzers/005-tilegrid/hclk_ioi/Makefile
@@ -1,4 +1,4 @@
-N ?= 10
+N ?= 6
 GENERATE_ARGS?="--oneval 1 --design params.csv --dword 0 --dframe 21"
 include ../fuzzaddr/common.mk
 
diff --git a/fuzzers/005-tilegrid/pll/Makefile b/fuzzers/005-tilegrid/pll/Makefile
index 0ff5ced3..e8557d80 100644
--- a/fuzzers/005-tilegrid/pll/Makefile
+++ b/fuzzers/005-tilegrid/pll/Makefile
@@ -1,3 +1,3 @@
-N ?= 10
+N ?= 6
 GENERATE_ARGS?="--oneval 1 --design params.csv --dframe 1C --dword 23"
 include ../fuzzaddr/common.mk