diff --git a/Makefile b/Makefile
index ee03ff066..37748834b 100644
--- a/Makefile
+++ b/Makefile
@@ -905,12 +905,6 @@ BL_BOARDS  := $(filter-out simposix, $(BL_BOARDS))
 BU_BOARDS  := $(filter-out simposix, $(BU_BOARDS))
 EF_BOARDS  := $(filter-out simposix, $(EF_BOARDS))
 
-# SimPosix doesn't have a BL, BU or EF target so we need to
-# filter them out to prevent errors on the all_flight target.
-BL_BOARDS  := $(filter-out simposix, $(BL_BOARDS))
-BU_BOARDS  := $(filter-out simposix, $(BU_BOARDS))
-EF_BOARDS  := $(filter-out simposix, $(EF_BOARDS))
-
 # Generate the targets for whatever boards are left in each list
 FW_TARGETS := $(addprefix fw_, $(FW_BOARDS))
 BL_TARGETS := $(addprefix bl_, $(BL_BOARDS))