diff --git a/flow/platforms/asap7/config.mk b/flow/platforms/asap7/config.mk
index 16d431fd33..4844b0ffd3 100644
--- a/flow/platforms/asap7/config.mk
+++ b/flow/platforms/asap7/config.mk
@@ -71,6 +71,7 @@ export DONT_USE_CELLS          += SDF* ICG*
 export LATCH_MAP_FILE          = $(PLATFORM_DIR)/yoSys/cells_latch_R.v
 export CLKGATE_MAP_FILE        = $(PLATFORM_DIR)/yoSys/cells_clkgate_R.v
 export ADDER_MAP_FILE         ?= $(PLATFORM_DIR)/yoSys/cells_adders_R.v
+export MAX_UNGROUP_SIZE       ?= 100
 
 export ABC_DRIVER_CELL         = BUFx2_ASAP7_75t_R